Celebrity Jennifer Lopez Has the Cutest Reaction to Alex Rodriguez's Daughter Performing for Her Alex Rodriguez is a proud dad to daughters: 9-year-old Ella Alexander and 12-year-old Natasha Alexander By Karen Mizoguchi Published on June 10, 2017 12:31 AM Share Tweet Pin Email Jennifer Lopez may have discovered the next big singing talent in boyfriend Alex Rodriguez‘s daughter. Twelve-year-old Natasha Alexander performed a song for the World of Dance star, and Lopez, 47, had an adorable reaction all while Rodriguez, 41, proudly documented the moment Wednesday on his Instagram story. “I’m a little jealous of Tashi but Jen look so happy so I’m happy for my girl,” the retired Yankees player captioned his video. Rodriguez and his daughter have been in Las Vegas with Lopez as she gets ready to perform this weekend for her All I Have residency dates. On Wednesday, they boarded a private jet from Miami to Las Vegas. Lopez’s 9-year-old twins, Maximilian David and Emme Maribel, were spotted back in Los Angeles with their father Marc Anthony on Friday. Getty (2) “They arrived in Las Vegas together. They both looked happy,” a source previously told PEOPLE of the couple. “J. Lo has several shows this week. A-Rod is staying in Las Vegas with her.” Most recently, Lopez and Rodriguez enjoyed some joint family time by the pool with their kids as the two families have grown close since PEOPLE confirmed in March that the pair were dating. This isn’t the first time they have brought their families together since their relationship became public. In April, Lopez and Rodriguez took their kids to the Dominican Republic during Easter weekend. Emme and Natasha seemed to hit it off, with the Shades of Blue actress sharing an Instagram photo of the two smiling together.