David Lucado didn't just cheat on Britney Spears with the girl next door -- apparently, he two timed with a hardcore porn actress. Classy!

Allegedly, the other woman in the mix is hardcore porn star Cali Lee -- a 29-year-old, 5 foot, 96 pound lady who gets pounded on camera for money, reports TMZ.

Some of her most notable films include (but are not limited to): 8th Street Latinas 20, Perfect Little T*tt*es, Big D*ck in a Little Chick 1, Fresh Outta High School 14.

Aww!

As we previously reported last month, BritBrit kicked out her less-than man after finding out that he was videotaped hooking up with a mystery woman. Apparently, Brit's dad bought the vid -- so don't expect to see Cali's handiwork with David any time soon.