June 16, 2016 07:00 PM

After celebrating her parents’ 50th anniversary with a sweet party and some cake, Gwen Stefani treated her boys to a fun day at Knott’s Berry Farm over the weekend.

The former Voice coach shared photos and videos Saturday of her adorable sonsKingston, 10, Zuma, 7½, and Apollo, 2 — on her Snapchat account from various rides at the amusement park.

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PEOPLE also has exclusive photos of the rocker and her kids — along with her niece Stella — riding the new Ghostrider ride.

“They rode Ghostrider four times and were also seen picking out candy and taffy in Camp Snoopy,” an onlooker tells PEOPLE.

Tibrina Hobson/Getty Images

The singer, 46, heads out on tour next month, but has another milestone to celebrate first — her boyfriend Blake Shelton celebrates his 40th birthday on Saturday.

“I just want my boys to be happy and healthy, and I just ask God to guide me every day to be a good mother because it is not an easy job,” she said recently about motherhood.

— Melody Chiu

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