Dianna Agron Caught Smooching Lily Collins’ Ex-Boyfriend, Thomas Cocquerel

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Ex-boyfriends may be off limits to friends in Mean Girls, but as we've learned from the many, many times Hollywood besties have taken each other's leftovers, it's NBD. While we're happy to hear that people can play nice even after dating the same person, it doesn't make it any less shocking for us looking from the outside in.

Most recently, Dianna Agron was spotted getting her mack on with Aussie actor Thomas Cocquerel at Coachella this past weekend. You probably recognize his name from when we introduced you to him at the beginning of February… as Lily Collins' boyfriend. At the time, their relationship was described as "new" and she was "clearly smitten" and "happy."

Considering the 27-year-old Glee actress and 25-year-old Mortal Instruments star have been photographed at various parties and celebrity-filled events looking all buddy-buddy, we hope that things completely ended between Lily and Thomas before Dianna sunk her claws into him. To see the smoochy pictures for yourself, visit our friends at Just Jared Jr.

Play 'Who Said It?' with Lily Collins & her co-stars from The Mortal Instruments:

Proof Lily Collins is the Most Bad-Ass Chick Ever