How Casper Smart Plays Dad to Jennifer Lopez's Twins
Casper Smart and Jennifer Lopez on February 26, 2012 in West Hollywood, California. Credit: Jeff Vespa/VF12/WireImage Jennifer Lopez isn't the only one getting pampered by Casper Smart . The backup dancer-turned-choreographer makes it a point to spoil her 4-year old twins (with ex Marc Anthony ), and stopped by a recent Xbox 360 event in L.A. to score some games for Max and Emme . "He was going on about how he loves playing with them," says a witness. PHOTOS: Jennifer and Marc, the way they were Smart, 25, is equally enamored of his girl, 43. "He's madly in love with her," the insider says of Smart, who will join Lopez on the European leg of her tour in October. Adds the source, "It's not just that she's his lover, she's also his best friend." Smart and Lopez first stepped out together in Fall 2011, just a few months after her painful July split from Anthony, whom she wed in 2004. VIDEO: Half-naked Jennifer Lopez shows off her boxing...