"Momma, Brian, and me are all so grateful for all your well wishes. My lil sissy Gracie Elliot Teefey was born on June 12. Luv you all so much." Selena Gomez confirms reports her mum Mandy Teefey has given birth to a baby girl in a proud big sister post on her Facebook.com page. The tot is 37-year-old Teefey's daughter with the pop star's stepdad, Brian Teefey.