Derek Hough Shares Funny Video of Sister Julianne Falling Off a Diving Board!

Derek Hough pushes his cart through the parking lot as he and girlfriend Hayley Erbert do some shopping on Sunday (July 7) in Studio City, Calif.

The 34-year-old Dancing with the Stars pro showed off his muscles in a gray tank shirt and jean shorts as he and his girlfriend ran errands together.

PHOTOS: Check out the latest pics of Derek Hough

In honor of his sister Julianne Hough‘s Golden Buzzer on America’s Got Talent, Derek took to Instagram to share a video of her falling off of a diving board!

“I would’ve given this dive from @juleshough a golden buzzer👍🏼,” Derek captioned the below video.