ET caught up with Banks and her mom, Carolyn London, in New York on Tuesday where they opened up about the former model's struggles with IVF.

ET caught up with Banks and her mom, Carolyn London, to chat about the new book they co-authored, 'Perfect Is Boring.'

The model shares the secret in her new book, 'Perfect is Boring,' co-written with her mom, Carolyn London. It's out April 3.

The 'America's Got Talent' host also dished on her 2-year-old son's latest milestones while speaking with ET at a fan event for the NBC series. 'AGT' returns May 29 on NBC.

On Wednesday, ET caught up with Sports Illustrated's fierce females, including Upton and Tyra Banks, at the Swimsuit 2018 Launch Party, where the 25-year-old model opened up about her recent shoot in Aruba.

The 'America's Next Top Model' creator and the 24-year-old cover star are quickly becoming #friendshipgoals! The 2018 'Sports Illustrated' Swimsuit issue is out now.