Nick Viall and Fiancee Vanessa Grimaldi Pose for Cute Photos With 'DWTS' Pro Peta Murgatroyd's Baby

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Three reality stars and a baby!

After announcing his engagement on Monday night's season finale The Bachelor, Nick Viall was back rehearsing for his debut on Dancing with the Stars with pro partner Peta Murgatroyd and got a visit from her and Maksim Chmerkovskiy's newborn son, Shai, and his fiancee, Vanessa Grimaldi.

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"FINALLY we can all be together ? #TeamBabyGotBach is here & we CAN'T WAIT to perform for you on Monday @DancingABC ?? #TeamNickandVanessa ❤️," Murgatroyd tweeted along with a photo Viall holding her baby while she and Grimaldi struck a pose.

Viall also shared the photo on Instagram, writing: "TEAM BABY GOT BACH... is ready for Monday night !! Well these three are.. I'm terrified! I think we make a pretty great team. #teambabygotbach #dwts #thebachelor"

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Meanwhile, Grimaldi posted another pic of her kissing Viall while Murgatroyd sweetly smooched her son.

These three have become fast friends. In Murgatroyd's Instagram story on Wednesday, she also revealed that Grimaldi gifted her with a baby book.

On Tuesday, ET's Lauren Zima spoke with Viall about how his debut dance was coming along, and he revealed that he and Murgatroyd will be doing the cha-cha to “Let Me Love You” by DJ Snake and Tiësto, featuring Justin Bieber.

He also praised his supportive fiancee. "[Vanessa] might be slightly more excited than I am. It's going to be fun," he said before gushing over his pro partner. "I have a great partner in Peta. If I'm lucky enough to stick around, hopefully it's going to be fun for America to watch her journey - having just had a baby boy and coming back from that."

"We're almost like brother and sister," he added of his relationship with Murgatroyd. "We'll be dancing, and obviously dancing is meant to be romantic and sexy and things like that, but we really just have this goofy, playful thing. Maks has been very gracious and kind. She's a goofball, I'm a goofball. I feel like our team chemistry is really good."

WATCH: Details on Vanessa Grimaldi's Huge Engagement Ring -- and Her Bachelor Dress That's for Rent!

Ahead of the season premiere of DWTS, former Bachelor star Chris Soules claimed that Viall "loves being famous" in a Facebook Live chat with ET. "I've talked to him [about DWTS]," Soules said. "I think the guy's got it down. He's kind of a reality television pro."

"Chris has a way with words sometimes. He has done a lot of reality TV himself," Viall responded in an exclusive interview with ET. "I don't have a reaction to [his comments that I'm seeking fame]. Listen, I'm very grateful Dancing asked me to do it. It should be fun."

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