Vanessa Lachey Celebrates Son's Birthday With Peta Murgatroyd and Her Baby

Peta Murgatroyd and Vanessa Lachey with their babies

The ladies are competing against each other in the new season of 'Dancing With the Stars.'

There's no team rivalry between Peta Murgatroyd and Vanessa Lachey!

The Dancing With the Star pro spent her Saturday at Vanessa and Nick Lachey's son Camden's fifth birthday party and brought her adorable 8-month-old son, Shai, along for the celebration.

"At Lachey Racing ? wishing Camden a Happy 5th Birthday ??? Thank you Mr and Mrs Lachey for having Shai and I ❤️ #teammomandpops and #teambabiesandballroom," Murgatroyd wrote alongside a pic of herself holding Shai and Vanessa holding 8-month-old son Phoenix.

Vanessa and Nick are competing against each other in the upcoming 25th season of DWTS with Maksim Chmerkovskiy and Peta, respectively, who are also a married couple.

ET recently caught up with Nick and Vanessa during their rehearsals where they gave us the scoop on what to expect when they hit the ballroom.

"The goal we've decided as a family unit, a fam bam, [is] let's get to the finals together," Vanessa explained. "And then, as Nick is quoted as saying, the gloves come off, I guess. We just don't want it to be awkward, like, week three that I'm sitting in the audience watching him and Peta dance or vice versa."

"If we're sitting in the audience week three, I'm going to be embarrassed to show up to the ballroom," added Nick.

Season 25 of Dancing With the Stars premieres Monday, Sept. 18 at 8 p.m. ET/PT. For more on what to expect, watch below!