(Photo credit: Paul Archuleta/Getty Images)

It's tough to believe, but Nick Lachey is 40 years old today. The singer, who shares his birthday with his wife, Vanessa, is celebrating with friends in Los Angeles, but we can celebrate together by re-watching a few of his best videos ever. From his hits with his boy band, "90 Degrees," to the video he made with his now spouse to a recent interview in which he discusses becoming a dad, re-live a few highlights from Lachey's life and career!

"Invisible Man" Nick Lachey started his career in the band 98 Degrees, and their first single was "Invisible Man," which came out in July 1997.

"Because Of You" Just one year later, the band had scored a song on the "Mulan" soundtrack ("True To Your Heart") and followed it up with their first monster hit.

"I Do (Cherish You)" This video from 1999 features the band in suits - and Ali Larter!

"The Hardest Thing" One of their most recognizable songs was released in 1999 - and the boxer features Lachey as a boxer.

"Thank God I Found You" In 2000, the video for "Thank God I Found You" was released, and showcased the band performing with the likes of Mariah Carey. Their work scored them a Grammy nod!

"My Everything" That same year, the band released "My Everything," and the video features Lachey cuddling with then-girlfriend Jessica Simpson. (It's pretty adorable.)

"Give Me Just One Night (Una Noche)" And their foray into Spanish!

Where You Are And Lachey even did a duet with Simpson!

"Sweetest Sin" Lachey married Simpson in 2002, and by the summer of 2003, they were starring in a new reality show, "Newlyweds." They also starred in this super-sexy video together.

"What's Left Of Me" By early 2006, Lachey and Simpson had split, and he released this video for his aptly-titled song, "What's Left Of Me." The upside? It features his now-wife!

"I Can't Hate You Anymore" A few months later, he followed that video up with this one, for the second single from his album.

Lachey became a dad for the first time when his son, Camden, was born in Sept., 2012. A few months later, he released an album of lullabies and talked about touring with 98 Degrees again. "It'll be a different kind of tour than it was 12 years ago, but it will be more special to share it with our families," he said.