In the photo, Jenner (sans ring) sweetly rests her head against Tyga's knee. The picture was captured at the PrettyLittleThing.com U.S. Launch Party, which was hosted by Jenner in Los Angeles on Thursday.
Jenner has previously ignited similar rumors of an engagement to her rapper boyfriend. In July 2015, she posted a photo of her wearing a diamond band on her left hand, but tweeted soon after that she was "not planning on getting married anytime soon."