The 4-year-old started his first day of preschool on Wednesday.
The couple revealed the news on Instagram on Friday.
The Lachey family is moving into a bigger "crib."
The band has a whole new appreciation for their die-hard fans and the new generation that has also come to love them.
Plus, another surprising 'Live!' contender emerges.
The band opened up to ET on Thursday while promoting their My2K summer tour.
The 98 Degrees singer told ET about the letter her wrote to Rivera's family when he purchased the property earlier this month.
The singer opened up to ET on Thursday about why his recent real estate purchase was so special.
The band said they have nothing but respect for today's young pop stars who can deal with 'that kind of fame at a young age.'
98 Degrees is gearing up to hit the road this summer for a star-studded nostalgia tour.
Twenty years (and several kids!) after their debut, Drew and Nick Lachey, Jeff Timmons and Justin Jeffre are hitting the road for the "My2K Tour."
The stars came out to support a worthy cause.
#SorryNotSorry, but this rock band isn't going anywhere.
Miley Cyrus and Liam Hemsworth appear to be back on and now we're taking a look at celebrity couples who have broken up only to reconcile for good.
