Cara Delevingne Squeezes Joan Smalls' Boob, Rihanna Goes Topless And More Of What You Missed On Instagram

Rihanna Topless Brazil

[Photo Credit: @badgalriri]

Kim Kardashian Wardrobe Malfunction

[Photo Credit: @kimkardashian]

Cara Delevingne Karlie Kloss Joan Smalls

[Photo Credit: @caradelevingne]

Ian Somerhalder

[Photo Credit: @iansomerhalder]

Madonna

[Photo Credit: @madonna]

Jessica Simpson, Ashlee Simpson, Tina Simpson

[Photo Credit: @JessicaSimpson1111]

Gwen Stefani, No Doubt

[Photo Credit: @gwenstefani]

Tamar Braxton Logan

[Photo Credit: @tamarbraxtonher]

Michael Bublè Baby Noah

[Photo Credit: @michaelbuble]

La La Anthony MLK Day

[Photo Credit: @lala]

Michael K. Williams MLK Day

[Photo Credit: @bkbmg]

Justin Bieber MLK Day

[Photo Credit: @justinbieber]

Cara Delevingne is very close with her girlfriends. She's been crab hunting with Rihanna in Barbados, smoking e-cigarettes and smooching Michelle Rodriguez at a New York Knicks game, and now we've learned how she and her fellow Victoria's Secret pals hang after hours.

Models Delevingne, Karlie Kloss and Joan Smalls revealed that the leggy beauties who walk the runway together also enjoy to share the same bed (and a casual boob grab). Meanwhile, on another continent, Princess RiRi was sunning herself in Brazil sans bikini top (that's the only way to avoid epic tan lines, am I right?).

Your glorious long weekend has officially come to a close, which means it's time to study up on recent happenings in order to keep your water cooler talk fresh. Queen Madge was placed on the hot seat after captioning an Instagram photo of her son, Rocco Ritchie, with a racial slur, proving that she doesn't always have the best judgment when it comes to social media and her children. Maybe she should ask Instagram newcomer Gwen Stefani for some tips? While The Vampire Diaries star Ian Somerhalder was getting lost in his own beautiful eyes, stars like La La Anthony, Michael K. Williams and Justin Bieber celebrated the life and legacy of Dr. Martin Luther King, Jr. Check out what you missed on the 'gram over the weekend, and what you should formulate an opinion on stat, by clicking through our gallery above.

[Photo Credit: @rihanna, @kimkardashian, @caradelevingne, @lala]