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Gwen Stefani, Parents, Snapchat

Gwen Stefani / Snapchat

Gwen Stefani had a family fun day Saturday with her three sons and parents, who marked a very special occasion.

The group celebrated Dennis and Patti Stefani's 50th wedding anniversary with a party, complete with a gorgeous three-tier wedding-style cake covered in white fondant, adorned with white roses, gold leaves and trimming and topped with a pair of wedding bells.

Gwen posted a photo of the dessert on Snapchat, as well as a sweet pic of her parents sharing a tender kiss.

Gwen Stefani, Parents, Snapchat

Gwen Stefani / Snapchat

Gwen Stefani, Parents, Snapchat

Gwen Stefani / Snapchat

Gwen Stefani, Parents, Snapchat

Gwen Stefani / Snapchat

Following the bash, Gwen and her boys headed to Knott's Berry Farm in Buena Park, California. The 46-year-old rock and pop singer and The Voice star grew up near the area and has visited the amusement park with her family many times.

Gwen Stefani, Son Zuma, Snapchat

Gwen Stefani / Snapchat

Gwen Stefani, Son Zuma, Snapchat

Gwen Stefani / Snapchat

Gwen and her sons, Kingston, 10, Zuma, 7, and Apollo, 2, were spotted riding roller coasters and other rides together. The singer posted several photos and videos of their outing on Snapchat.

Gwen Stefani, Son Apollo, Snapchat

Gwen Stefani / Snapchat

Gwen shares her boys with ex Gavin Rossdale. She filed for divorce from the 50-year-old Bush singer last August after 13 years of marriage. The two reached a settlement in April.

For at least the past six months, she has been dating her The Voice co-star Blake Shelton, 39. He did not accompany her and her family during Saturday's festivities, although he has spent time with her sons and parents before. The country star performed at the 2016 CMA Music Festival in Nashville that day.