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 Demi Lovato, Wilmer Valderamma

Let the birthday celebrations continue!

Demi Lovato may have received an adorable puppy Thursday when she turned 23. But the "Cool for the Summer" singer managed to keep the party going as she traveled to Knott's Berry Farm Saturday for an afternoon with boyfriend Wilmer Valderrama.

The Hollywood pair arrived at the Buena Park, Calif., theme park with friends where they immediately headed for the roller coasters including Silver Bullet and Xcelerator.

According to attendees, the couple was always holding hands even as they screamed together on the thrill rides.

Demi Lovato

Jerod Harris/Getty Images

"They made a lovely couple," an eyewitness told E! News exclusively. "They indeed looked very happy."

Another eyewitness spotted the pair "hugging" and "making out" after enjoying dinner together at one of the park's restaurants.

"Perfect day... Adventurous and filled with ‘Oh S--t Moments' hahaha," Wilmer wrote on Instagram. "Thanks #KnottsBerryFarm!!"

As Demi begins another year at the top of her game, the former Disney star can't help but gush about her main man. 

 Demi Lovato, Wilmer Valderamma

Twitter/ColinKate

"Are you f--king kidding me?!! I'm so in love it's ridiculous," she recently wrote on Instagram when naming Wilmer her #ManCrushWednesday. "I couldn't be more proud of him."

And for those thinking that they've seen this pair stepping out in public more often in recent months, you would be correct. During a recent interview with HuffPost Live, the "Heart Attack" crooner admitted that she can't let public scrutiny affect her special romance.

"...As time has gone on, people are seeing us more together and we thought, you know what? If paparazzi gets us, then whatever, but we're in control about what we're able to post online," she explained. "So we're very open about our relationship. I don't know—I think as I get older and more serious in my life, I just am proud. I'm very proud."

 Demi Lovato, Wilmer Valderamma

Twitter/ColinKate