The Oscars is basically Hollywood's prom night -- with all of the biggest stars in the business decking themselves out in dramatic gowns and crisp tuxedos for the big night. And while thousands of professional photos were captured on the press line, stars had fun taking pictures of themselves all dressed up. And thanks to our good friend social media, the stars shared their personal pics on Twitter -- and we've compiled the best TwitPics and Instagrams from the night!

Check out our favorite captured moments below (Selena Gomez eating In'N'Out burger with Lily Collins in formalwear may be the best thing ever) and the rest of the hottest Oscar night pics from Katy Perry, Diddy, Sofia Vergara and more in the gallery!

Selena Gomez: 

@selenagomez: "Yep. Classy gals chillen at the Vanity Fair Oscar party

Selena Gomez and Lily Collins in an Instagram at the Vanity Fair Oscar partyRelated article: Oscar Rumor Mill: Selena Ditches Justin? Cameron Bans Demi?


Almost there! In Tom Ford and Anna Hu!

Related article: Ashton Kutcher Brings New Lady Friend to Post-Oscar Bash?!


Kelly Osbourne:

 @MissKellyO: "I got a kiss from one of the hottest chicks in Hollywood!"

Kelly Osbourne tweets a pic of her and Miley Cyrus at the 2012 Oscars Vanity Fair party