Kourtney Kardashian is expecting her first child with her husband, Travis Barker.The reality television star and eldest daughter of the Kardashian family made the surprise announcement during Barker's Los Angeles concert Friday night. Barker is the drummer of Blink-182.Holding up a handwritten sign that said: "Travis I'm pregnant," Kardashian caught the eye of her husband on stage, who promptly went into the crowd and embraced Kardashian.Kardashian, 44, and Barker, 47, followed it up by posting a video of Kardashian holding the sign on their Instagram accounts.The couple already has six children between them from previous relationships.Kardashian is the mother to Reign, 8, and Mason, 13, plus daughter Penelope, 10, with her ex-boyfriend, Scott Disick. And Barker's children are Landon, 19, daughter Alabama, 17 and stepdaughter Atiana, 24, with his ex-wife, Shanna Moakler.