Ariel Winter and her underboob had a graduation party.

In celebration of her graduation from high school and complete removal from jailbait territory, Ariel Winter had a graduation party that involved lots of themed decorations. And 18-year-old Winter brought her own decorations to the party that her sister threw for her.

Couldn't be more grateful to @shanelle_gray & @davidbarrygray for throwing me the most amazing graduation party ever last night...the amount of love and support they've shown me for the past four years has been life changing. My sister is my absolute best friend and my everything...❤️ Thank you so much. I couldn't be luckier or more grateful. I was in awe last night and I still am that you guys love me that much to do all of that for me...I never would be where I am today without you two...you guys saved me and taught me to be the person I am today. Dad...I love you!!! Thank you for always being there to support and love me as well and always put a smile on my face no matter what :). I'm so grateful for the bond we now share. Alenah the song you put together with Shanelle and recorded for me was one of the most special gifts I've ever received. I'm still tearing up thinking about it. Thank you for that and for your beautiful, special performance. Also a big thank you so much to Geraldine for putting it all together and to @contemporarycatering @robpauerful for the most amazing food! A special thank you as well to Sharon who is probably the biggest reason I was able to get through high school and accepted into college...you pushed me to always do my best and encouraged me...not to mention you were always there for my 1am freak outs about late projects :) Anddddd thank you SO MUCH to all of my amazing family members and friends that flew in to celebrate with us- you guys are the absolute best. Thank you also to the ones who didn't have to fly in...so much love was felt all around last night. Thank you thank you thank you!!!!!! Class of 2016...❤️ #uclabound

A post shared by ARIEL WINTER (@arielwinter) on Jun 19, 2016 at 11:57pm PDT

Honestly, this may be the best Winter's boobs have ever looked.

Ariel Winter and her underboob had a graduation party.

Her party dress was as light in both color and coverage as the dress she wore to her actual graduation.

Hello UCLA, 4s up 😌 #graduation

A post shared by ARIEL WINTER (@arielwinter) on Jun 14, 2016 at 7:34pm PDT

Winter appears to have been quite busy celebrating the end of high school, having posted a picture from another grad party on the 'gram.

Hey b, it's me... 😘

A post shared by ARIEL WINTER (@arielwinter) on Jun 15, 2016 at 1:08pm PDT

She looks a bit like a boobalicious Anne Hathaway in this photo.

Happy Father's Day to my amazing dad💕I'm so grateful to have you in my life. You're always there for me, and I couldn't be more grateful for your consistent love and support. I love our little inside jokes, and how we can make each other laugh until we start crying and actually can't stop. I'm so grateful for all the amazing daddy-daughter memories we've made over the years and I can't wait to make more throughout the years. Thanks for being the real MVP and the coolest/best dad out there.❤️

A post shared by ARIEL WINTER (@arielwinter) on Jun 19, 2016 at 2:27pm PDT

Winter is heading off to UCLA in the fall, where she will surely take advantage of her talent at looking really good in dresses.