Kourtney Kardashian and Travis Barker announce baby's gender in sweet video.

Kourtney Kardashian and Travis Barker revealed the sex of their baby in a video shared on Instagram, showing blue streamers launching into the air to mark that they are having a boy. The couple announced they were expecting a week ago, and Kardashian shared a series of photos on Father's Day showing off her baby bump. Kardashian and Barker's fertility journey was chronicled throughout Season 2 of Hulu reality series "The Kardashians," as the couple went through in vitro fertilization treatment and talked openly about trying to have a baby together. Kardashian shares kids Mason, 13, Penelope, 10, and Reign, 8, with ex Scott Disick. Barker shares kids Landon, 19, and Alabama, 17, with ex Shanna Moakler.