'This Is Us' star Justin Hartley jokes about why he didn't wobble in viral video: 'I am not a big fan of second weddings'

• "This Is Us" star Justin Hartley told Insider why he didn't dance in his cast's viral wobble video.
• "I am not a big fan of second weddings," he joked.

"This Is Us" star Justin Hartley told Insider why he didn't participate when his cast performed the wobble dance between takes while filming Kate's (Chrissy Metz) wedding to Phillip (Chris Greere) in the show's final season.

"It was a second wedding. I am not a big fan of second weddings, and so I didn't want to participate," he joked about the video, which was posted to Instagram back in April while promoting Revel Spirits and their new agave spirit, Revel Avila Spritz. "I went, 'Screw it.' I was going to be on my phone, and that's it."

NBC's hit family drama, "This Is Us," followed the Pearson family, led by parents Rebecca and Jack Pearson (Mandy Moore and Milo Ventimiglia, respectively), for six seasons over many decades and across different time periods. The Pearsons' daughter, Kate, divorced her first husband Toby (Chris Sullivan) and during the show's finale season, viewers saw her marry a second time to Phillip.

In his life offscreen, Hartley's second marriage was to "Selling Sunset" star Chrishell Stause. He has since remarried to his former soap costar Sofia Pernas.

Susan Kelechi Watson — who played Beth, the wife of Randall Pearson (Sterling K. Brown), the family's adoptive son on the show — posted the video of the cast dancing to her Instagram account and it quickly went viral.

The video features nearly all of the cast members who had a scene during Kate's wedding episodes, including Metz, Brown, Moore, and Watson, doing the popular dance while in full wedding attire. However, Hartley, who played Kate's brother on the show, appears to be making phone calls while sitting on the couch in the foreground of the video.

A post shared by Susan Kelechi Watson (@susankelechiwatson)

When asked back in April, Hartley's costar Alexandra Breckenridge, (who played Kevin's wife Sophie) told Glamour she didn't know why Hartley chose not to dance. Watson also joked on "The Kelly Clarkson Show" in May that Hartley "knows his position."

Jokes aside, Hartley told Insider that he can do dances that are choreographed for him in scenes but prefers not to dance otherwise.

"It's like the only thing I'm insecure about is dancing," he continued. "For some reason, I always feel like I look like a jackass when I'm dancing."

The "Senior Year" actor remembered dancing in another unnamed video with the cast years before and when he lost the choreography and "just started doing my own thing" he felt ridiculous.

"I watched it back again, and I was like, 'Yeah, I look like a jackass. Why would I ever do that? Why would you ever do that?'" Hartley explained. "So I made a vow to myself never to do that again."

Hartley said being on the phone in the forefront was a planned bit, but he hoped he didn't take away from "the magic of that beautiful, ridiculous TikTok moment." He added that if he had to do it over again, he would be "asleep."