Timothée Chalamet, His Mom & Kylie Jenner Hang Out at 'Marty Supreme' Event

Timothée Chalamet brought the ladies in his life to a "Marty Supreme" event Monday night ... with both his GF Kylie Jenner and his mom Nicole making an appearance.

The actor attended a special screening of his Oscar-nominated film at DGA Theater in L.A. ... and did a live interview afterward onstage for LeBron James and Steve Nash's podcast "Mind The Game."

TMZ obtained video of Chalamet and Jenner hanging out backstage ... chatting with several people -- including fellow Academy Award nominee William H. Macy.

While Nicole isn't in the video, we do know she didn't miss her son's big moment ... because she posed for a pic with LeBron -- grinning from ear to ear while locking the 6'9" basketballer in a tight embrace.

It's been a busy week for Timothée and his mom ... they attended the Actor Awards together on Sunday.

While he ended up losing the Outstanding Performance by a Male Actor in a Leading Role trophy to Michael B. Jordan, Nicole won an even bigger prize ... Kris Jenner called her "gorgeous" in her Instagram comments!

So it seems the two families have gotten very close since the A-listers began dating in 2023 ... perfect in case these stars decided to tie the knot!