Taylor Swift, Jennifer Lopez Recording Duet: Ex-Boyfriends Bashed In New Song?

American Idol judge, Jennifer Lopez and singer Taylor Swift are planning to collaborate on a song for their fans.

According to Us Weekly the girls performed "Jenny on the Block" together and the giddy girls had so much fun together that they may be planning to make a hit together. Swift tweeted, "

 "Sang Jenny From the Block with @JLo tonight at Staples Center. STILL FANGIRLING OUT ABOUT IT."

Lopez tweeted back to the songstress, "@taylorswift13 had so much fun with you tonight!!! #RedTourLA #jennyfromtheblock #hairbrushsongs."

A source close to the girls told Us Weekly, "Both of them are huge fans of each other and excited to work together."

We wonder if the new track will be about Marc Anthony and Swift's new love interest.