Tarek El Moussa cited for battery following heated physical altercation in Las Vegas casino

Tarek’s flip side.

Tarek El Moussa was cited for battery after the “Flip or Flop” alum allegedly knocked a man out in Las Vegas last week.

The HGTV star and another male were involved in an altercation at the Palazzo at the Venetian Resort in Sin City on June 5, the Las Vegas Metropolitan Police Department confirmed to Page Six Tuesday.

Tarek El Moussa was reportedly cited for battery after the “Flip or Flop” star allegedly knocked a man out in Las Vegas last week. Brian Zak/Page Six

The HGTV star and another male were involved in an altercation at the Palazzo at the Venetian Resort in Sin City on June 5, Page Six can confirm. Tarek El Moussa/Instagram

Witnesses alleged to TMZ, who was the first to report the news, that they saw El Moussa, 43, deliver a knee to the man’s head, which knocked him out cold.

An onlooker claimed to the outlet the incident was “bad,” adding that the guy looked seriously hurt. The alleged victim reportedly refused medical attention.

A source told Page Six that El Moussa was “protecting his elderly father” after the man allegedly got out of line with the real estate investor’s dad.

Witnesses told TMZ that they allegedly saw El Moussa deliver a knee to the man’s head, which knocked him out cold. Getty Images

A source told Page Six that El Moussa was “protecting his elderly father” after the man allegedly got out of line with the real estate investor’s dad. Tarek El Moussa/Instagram

Cops arrived at the scene around 11 p.m. and took a crime report. Though they declined to arrest El Moussa, he was cited for battery.

A rep for El Moussa did not immediately respond to Page Six’s request for comment.

A few days ago, El Moussa’s wife, Heather Rae Young, shared snaps from their family Vegas trip on Instagram.

Cops arrived at the scene and took a crime report. Though they declined to arrest El Moussa, he was cited for battery. Getty Images for HGTV

A few days ago, El Moussa’s wife, Heather Rae Young, shared snaps from their family Vegas trip on Instagram. Tarek El Moussa/Instagram

“Not our average Vegas trip… 🎰💎🖤,” she captioned the post. “Watched Tarek do his thing on stage (so proud!) and made it extra special by bringing our parents along for the ride.”

“We got to show them a glimpse behind the scenes — our world, our work, and of course, the glam. Grateful for these moments that we get to spend together. 🥂✨,” the former “Selling Sunset” star, 37, added.

Young did not mention the altercation.