Jenna -- Half the Size of Tito

8/24/2007 4:02 PM PDT BY TMZ STAFF
Tito and JennaJenna Jameson, rapidly disintegrating healthily downsized porn goddess actress/producer and BF Tito Ortiz got their groove on in a booth on the dance floor of Moon Nightclub at the Palms, and we're told that they sipped on Veuve Cliquot and Grey Goose Orange vodka.

Ortiz appears to be trying to lay an ass-grab on his lady, but when there's just not so much to grab ...