A/N- I'm a big Grey's Anatomy fan and I love The Parent Trap!!! Reviews are appreciated. I know this chapters short, but just stick with me.. Addek forever!!!!

Disclaimer- I own nothing just Katie and Jessie.

Chapter 1

December 11, 1992

Settle Grace Hospital

The raindrops beat down on Derek Shepherd's head as he ran around the car to open the door for his wife.

"Derek I hate this place" He laughed and helped her out of the car.

"Addi, give it a chance, ok. We're going to spend seven years of our life here.

"Don't remind me. I hear it rains here ever day. Can you believe that, Derek? Ever damn day"

"I'm very sorry about that Addison, but as you know I'm not the maker of weather"

"You're right I'm sorry Derek. I don't know what's gotten into me lately. I've been angry about everything" Derek opened the door to the hospital and they walked hand in hand into the party.

"Don't worry about it Addi. I forgive you" Addison smiled and Derek and gave him a quick peck on the lips. Derek saw a friend at the bar and left Addison to mingle with some of the female guests.

"So, this is the Pre-first day Mixer that I've heard so much about" Addison said to the women to her left.

"Yup, this is it. I'm Kathy Martin. I take it you're going to be an intern too" Addison stuck out her hand and shock Kathy's.

"I'm Addison Shepherd. And yes, I'm a surgical intern. I'm hoping to be an OB-GYN surgeon, but time will tell" Kathy nodded and looked at Derek as he approached them.

"Wow!" Kathy whispered.

"What?" Kathy pointed and Addison turned around.

"Already making friends I see" Addison smiled and took Derek's hand into her own.

"Kathy, this is my husband, Derek Shepherd. We've been married two months"

"Congrag!" Kathy smiled at the happy couple.

"Best two months of my life" Kathy excused herself and Derek led Addison outside to the balcony. It had stopped raining and the city was shinning brightly.

"It's so beautiful out here" Derek said looking at the stars and then back at Addison.

"Yes, yes it is" Addison blushed when she saw that Derek looking at her. He brought his lips down on hers for a long kiss. They broke apart, breathless a few moments later. They were joined on the patio.

"Excuse me. Would you mind if I took your picture?"

Derek and Addison nodded. Derek took Addison into his arms and smiled at her lovingly. She smiled right back, staring into his piercing blue eyes. The camera flashed.

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15 Years Later

Summer

New York, New York

"Katie Montgomery!" Addison looked at her watch. Katie was supposed to be at the airport in thirty minutes. Finally Addison gave up on yelling and reluctantly walked up the stairs. She opened the door and turned on the lights. Katie made no movements. The only thing that was visible was Katie's red hair under her pillow.

"Katie!! Let's go!" Addison made her way to the bed and took the pillow off of Katie's face.

"Mom, five more minutes" Katie grumbled blindly searching for the pillow to cover her face.

"We don't have five minutes, Katie. You've got to be at JFK in thirty minutes"

"I don't know why you got me a flight at the crack of dawn" Katie said as she rolled out of bed.

"I didn't get you a flight at the crack of dawn. Your flight leaves at 10, you just have to be there two hours early. If you hurry up, you can have some breakfast before we leave"

Katie walked into the bathroom to brush her teeth and comb her hair before throwing it in a bun. Katie was 5'8 and taller than most boys her age. At her grade school she excelled in volleyball and Addison knew she would also excel next year in High school. Katie had red hair, like her mother and blue eyes. Her mother was an OB-GYN surgeon and Katie hoped to follow in her footsteps.

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"All right. I've got to go" Katie turned around and looked at her mother.

"Ok, I'm going to miss you a lot"

"I'm going to miss you too, mom" Addison pulled Katie into a loving hug.

"I love you"

"I love you more" Katie smiled at her mom and then proceeded to walk through the security checkpoint.

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Los Angles, California

Derek Shepherd opened his eyes slowly and rolled over in his king size bed. Last night had been a long night and the hospital and Derek was glad he had taken today off to sleep in. Well, he didn't take the day off just to sleep in. He took it off so he could take his little girl to a summer program at Seattle Grace. Derek had many memories at Seattle Grace, most of which he wished he could forget about. He glanced and the clock.

"Jessie?" Derek yelled loudly as he found some clean pants and put them on. After finding a clean shirt his daughter bounded in the room.

"Good morning daddy" Jessie walked over to her father and gave him a kiss on the check.

Jessie had long red hair and wore glasses around her blue eyes. She was about 5'8 and had an athletic build. Jessie played basketball, but concentrated mostly on academics rather than athletics.

"Good morning, Princess. I just wanted to make sure you were ready to go. I was thinking maybe you wanted to stop by the hospital and say bye to all the nurses"

"That sounds like a great idea!"

After going to the hospital and saying her good byes it was time for Derek to drop Jessie off at the airport.

"I'm going to miss waking you up for work, dad"

"I'm going to miss that too. Now I'm going to need to buy an alarm clock for this month" Derek and Jessie laughed together and then Derek pulled his daughter into another hug and kissed her forehead, "I love you princess"

"I love you too dad" Derek watched as she walked away. She turned around for the final time before she went through security. As she did so, she put on her glasses and waved to him for the last time. Derek had to take a second look, because for a second he was sure Jessie had turned into Addison.

Flashback:

After the mixer Derek and Addison made their way back to the car together. Derek started the car and they were on their way back to their hotel. Addison put on her glasses and pulled out a map.

"Derek, are you sure we're going the right way? I'm pretty sure we were supposed to make a left at that light" Derek laughed and took Addison's hand into his own.

"Addi, we've lived her for a week now, I'm pretty sure I know my way around"

"Well, we'll see about that, Shepherd" Derek laughed again and received a scowl from Addison.

Ten minutes later Derek finally admitted he was lost.

"So know you want my help? Why couldn't you have just asked me right when we left the hospital and then we wouldn't be in this predicament"

"I'm very sorry sweetheart"

"You'd better be sorry" Derek made a grab at the map, but Addison snatched it away just in time, "Keep two damn hands on the wheel, Shepherd!" Derek looked at Addison, shocked. He pulled the car off to the side of the road and then spoke to her.

"Addi, are you ok? You've been looking for a fight ever since we got to the mixer tonight. Do you want to tell me what's up?"

"No, nothing's wrong, Derek. I'm sorry"

"See, this is what I mean. You go from kind and perfect Addison to I hate everything that lives or breathes Addison.

Addison took off her glasses and threw the map down in frustration, "Stop yelling at me Derek!" Addison yelled at Derek.

"I'm not yelling!" Derek said louder than necessary. He instantly regretted yelling, for Addison had begun to cry.

"Addi, I'm so sorry. If something's wrong with you, then you should tell me. I'm your husband; we should work these things out together. Are you just nervous about your first day?" Derek asked taking her hand.

"Derek, I'm pregnant" Derek let go of Addison's hand and stared blankly at her.

After a minute or two of complete silence Derek said two words that he would regret for a long time, "Holy shit".

End Flashback

A/N- Let me know what you think. I'll update by Friday at the latest. I'm seeing Wicked on Saturday!!!!! Yay me!!!!