Tom Cruise The Sneaky Katie Holmes ASS GRAB ... On Tape!

8/10/2011 5:00 AM PDT

Tom Cruise -- The Sneaky Katie Holmes Ass Grab [VIDEO]

Tom Cruise really put the squeeze on his wife Katie Holmes last weekend in L.A. -- copping a SNEAKY feel of her ass at a Katy Perry concert -- and TMZ has obtained the hands-on footage.

Katie got the pat-down Sunday night at Nokia Theater -- and we're told, Tom's hand remained steadfast for most of KP's performance.

Side note: never invite Tom and Katie to your party ... we're told the couple's entrance delayed the concert a solid 15 minutes.

And watch closely -- standing next to the touchy-feely couple is none other than Katy Perry's hubby ... Russell Brand. What a handful.