Kourtney Kardashian has shocked fans amid reports that she secretly tied the knot with beau Travis Barker in Las Vegas on Monday morning.The Keeping Up With The Kardashians star and the Blink-182 hitmaker were said to have exchanged vows at the One Love Wedding Chapel in Vegas just hours after attending the Grammy Awards, according to TMZ.The publication claimed that the smitten duo chose a more low-key, light-hearted affair over an extravagant ceremony as they said their "I dos" at 1.45 am at the chapel, which is open 24 hours. The owner of the chapel, Marty Frierson, told PEOPLE: "I didn't know who it was until they pulled up.