Photo: OMG! Robert Pattinson & Kristen Stewart kissing?

Have Twilight co-stars Robert Pattinson and Kristen Stewart finally been caught locking lips?

The pair are thought to be dating, but have never admitted it and try to keep any indication of the truth under wraps – have they slipped up?

Rob is currently in Montreal visiting Kristen and best mate Tom Sturridge on the set of On The Road.

The photographer who snapped the shots told Celebuzz that they were taken: “around (Boulevard) St. Laurent … They left their hotel around 8:15, and they hopped in a van taxi and they kind of just got out … and during that 25 seconds, they were just making out and Tom Sturridge was standing there just looking … I’ve been chasing Twilight for the last year-and-a-half. I’ve been waiting for this shot for a long time.”

The snaps are a bit grainy but it certainly looks like Rob and Kristen, and the clothes are the same.

Have they finally been caught out?

Click here to see the photos.