Meghan Trainor's lips are moving and she's talking all things motherhood. 

The singer, who is mom to 19-month-old son Riley, revealed the crucial piece of advice.

She told the supermodel, who married Justin Bieber in 2018.

"‘The best thing you can do when you have a baby is find a group of moms and join them.' It's lifelines." 

Meghan is grateful for the bond she shares with her friends, even taking a moms' getaway.

"I got lucky. All the moms in our group are so cool," she revealed.

That's not the only bathroom talk Meghan spilled in the interview. 

Grammy winner also shared how she feels about the internet going wild over her revelation.

"I'd be like, ‘I have to piss! Move it!'," she explained. "He was like, ‘OK…' But it's my favorite part of the house."