Something tells us this young lady won't be washing her lips any time soon.
After all, it's not every day (or in this case, night) when Robert Pattinson plants a wet one on you.
The mystery woman apparently had joined the three for dinner.
But just who is the mystery gal?
Well, a source tells E! News that the person R.Pattz was smooching might be Caitlin Cronenberg, the daughter of director David Cronenberg, who is helming Maps to the Stars.
Of course, the emphasis is on "might" as it is a bit hard to tell for sure. Either way, the source insists that Rob and Caitlin are just friends.
Meanwhile, rumors have resurfaced that the Twilight star and Elvis Presley's granddaughter, Riley Keough, have been hooking up.
However, our source again refuted the speculation, saying they are just pals and definitely not dating.