It's no secret that Adam Lambert enjoys a good make out session. This is the guy that coined the phrase "tongue diving," after all.

Now, in a new video from the Scissor Sisters, the former American Idol star is seen making out with lead singer Jake Shears... while Katy Perry looks on and captures the lip lock on her camera phone!

It's funny stuff (and Lambert and Perry really did attend this group's NYC concert last month) and you can watch all the action below. The spit swapping takes place around the 1:15 mark:

Lambert Lip Lock