Jennifer Lopez channeled the legendary Marilyn Monroe for a seductive, yet sweet birthday serenade for her buddy, George Lopez who turns 49 today.

The stunning star, wearing a blonde wig and sparkling Marilyn-esque dress, appeared on Lopez Tonight to close out last night's show...and of course, wish G. Lo a happy birthday! We're loving how the performance was aired in black and white to give us that old Hollywood feel.

Muy caliente, J. Lo!