'Boy Next Door' Star Ryan Guzman -- JLo's Lip Service is Beyond

If Jennifer Lopez is looking for a new man, it sounds like she could set her sites on the dude she gets hot and heavy with in "Boy Next Door" -- cause he's a big fan.

Ryan Guzman was leaving the Palm Friday night when he told us JLo is by far the best kiss he's had on screen ... even though she only ranked him #2 during a recent interview.

The 27 year-old actor shouldn't fret about his runner up position ... Lopez put him above Clooney.