Still a kid at heart! Demi Lovato celebrates turning 23 with Snoopy as she visits a theme park with Wilmer Valderrama

She's still just a big kid at heart.

And singer Demi Lovato was all smiles when she celebrated her 23rd birthday with boyfriend Wilmer Valderrama with a trip to Knott's Berry Farm on Saturday.

Although the singer's actual birthday was on Thursday, she kept the party going with a fun trip to the Los Angeles theme park.

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