Were they celebrating more than just a birthday last night?

Khloe Kardashian's boyfriend Tristan Thompson and her family threw her a surprise 33rd b-day bash yesterday at the Blind Dragon, and rumors are swirling that the NBA star popped the question to his lady love before they arrived at the soiree! We highly doubt it, though, because nobody said anything about it on social media, and they ALL were going crazy posting pics and videos.

The happy couple posed for photobooth snapshots with Kim and Kanye, and spent a good portion of the evening making out and dancing. Kendall attended with beau A$AP Rocky, but Kylie rolled solo without new boo Travis Scott. Rob allegedly got in on the fun, but arrived via a private garage in order to avoid being photographed.

"You could tell that Tristan is really in love with her and stuck by her side all night. The family loves Tristan and they were all taking photos with him and really treated him like a family member," a source dished to E! News.

The Revenge Body star clearly had a blast, because she tweeted about how grateful she was this morning.

"Ok now I need a hangover remedy lol. My family and friends are the best!!! I feel so lucky!! I've never had a surprise party in my life! I was blown away! Im so lucky and blessed! Thank you so much baby!!! You treat me like a queen!" she wrote.

We have a feeling Tristan is going to put a ring on it soon!