United Kingdom, Sept. 22 -- Witney Carson is expecting another boy.

The Dancing With the Stars pro has sons Leo, five, and Jet, three, with her husband Carson McAllister, and the star took to Instagram to share an adorable baby reveal video ahead of the birth of their third child.

In the clip, the couple were standing on a jetty with their back to their two boys, who opened up an envelope to find out the sex of their upcoming sibling.

Leo produced a shocked reaction when he found out he was to have another brother, but he and Jet didn't let the news slip.

Instead, Leo picked up a blue bouquet of flowers and asked his parents to turn around.

There was some confusion as Jet had picked up the pink bouquet, but a chuckling Carson said: "...