Jennette McCurdy and Ariana Grande show off their colorfully decorated birthday cakes on the set of Sam & Cat in Los Angeles on Wednesday afternoon (June 26).

The two actresses and stars celebrated their joint birthday with Laverne & Shirley‘s Penny Marshall and Cindy Williams, who will make a guest appearance on an upcoming episode.

Ariana , 20, tweeted to Jennette, “Want to wish @jennettemccurdy, one of my favorite to ever exist, a happy birthday. Honored to share this day of birth with you. #jodyposture.”

And Jennette , 21, wrote back, “Happy birthday @ArianaGrande! We have been through it all, haven’t we? Canada, lobster pic, thom, fisherman hats, almost s’mores…”

FYI: Jennette is also pictured picking up some Jamba Juice during a break.

10+ pics inside…

Photos: Getty, SplashNewsOnline

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