Nick and Vanessa Lachey's Adorable Son Camden Starts Preschool -- See the Cute Pic!

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Camden Lachey is growing up!

The 4-year-old son of Nick and Vanessa Lachey started his first day of preschool on Wednesday, and looked like a total rockstar doing it!

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Vanessa took to Instagram to commemorate the occasion with one adorable pic of Camden all geared up and ready to go.

"#RockOn Preschool! Love you, Buddy! ?," Vanessa captioned the cute snap.

Camden and his little sister, Brooklyn, have been the stars of several of the former TRL host's latest Instagram snaps -- and who can blame her?

The two stole the show at the Lachey family vacation:

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Got all jazzed up for memorial day:

And gave their dad the sweetest sibling sandwich:

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And who can forget the Lacheys’ latest adorable Instagram post, announcing baby No. 3?

See more on their clever announcement in the video below.