In 2002, the band released their first album, Songs About Jane, which went multi-platinum in the US.
The Victoria's Secret angel is 20 weeks pregnant and it's right about the time her baby bump is starting to show.
Levine was not the one to miss the opportunity to post a couple-pregnancy selfie.
As part of Maroon 5, Levine has received three Grammy Awards, two Billboard Music Awards, two American Music Awards, an MTV Video Music Award and a World Music Award.
Since 2011, Levine has served as a coach on NBC's reality talent show The Voice.
Earlier, the singer posted a picture of his pregnant wife in a bikini, basking in the sun along with the caption "My two favorite laker fans," suggesting his baby news.
Even Prinsloo's "So far so good" picture hinted that they are expecting. But pregnancy is no easy journey, which Levine made quite clear during his appearance on The Tonight Show with Jimmy Falon.
The pair dined together at the Chateau Marmont, and even started off on the right foot by coordinating outfits (both opted for blue jeans and a white top), but that's as far as this love story went.
However, the pair reunited early this year for a spoof on coach began dating this brunette beauty (and model) in 2009.
WATCH: EXCLUSIVE: Adam Levine Is 'Ready to Be a Dad': 'That's What We're Here For' The 27-year-old model is on the final stretch of her pregnancy, due on Sept. Levine, 37, announced earlier this month that Maroon 5 would be rescheduling seven of their upcoming concert dates to prepare for the birth of his new baby.