Justin Bieber, Kourtney Kardashian still 'hooking up'

Los Angeles: Reality TV star Kourtney Kardashian and singer Justin Bieber have been reportedly "hooking up on and off". "They have hooked up a few times, including recently. It happens in LA," a source told people.com.  "He has met her kids, but they don't hook up around the kids. It's on nights when she has help and is able to go out," added the insider.  The pair were last seen together in late March following the Los Angeles leg of the pop star's Purpose World Tour.  Kourtney has three children -- daughter Penelope, 3, and sons Mason, 6, and Reign, 1 -- with former partner Scott Disick, who vacationed in Vail, Colorado with her family last week.  "Kourtney is great. Justin thinks it's cool that she is older and hot. She isn't clingy and has her own life," the source continued.  "There are no bad consequences for Justin to hook up with her. She is very easy going and just makes it fun for him to be around her.”