Celebrity Parents The Pretender! See Foo Fighters' Dave Grohl Guest Star on 'Ryan's Mystery Playdate' with Daughter Dave Grohl's 5-year-old daughter Ophelia, a.k.a. Fifi, appears alongside her dad in "Ryan's Legendary Playdate," airing Thursday on Nickelodeon By Jen Juneau Jen Juneau Twitter Jen Juneau is a digital news writer for PEOPLE. A '90s teen and horror film connoisseur, she started at the brand in 2016, after a decade of working as a technical writer and then moonlighting as a journalist beginning in 2013. Originally from New Orleans, Jen grew up both in NOLA and Florida and eventually attended the University of Central Florida in Orlando (still her home base!), where she earned a bachelor's in English/technical communication, with a minor in magazine journalism. People Editorial Guidelines and Anya Leon Anya Leon Anya Leon is a Senior News Editor and the Parents Editor for PEOPLE. She's been at the brand for over 14 years in various roles across the Entertainment, Lifestyle and News teams. She has appeared on PEOPLE's podcast, PEOPLE Every Day, and covers everything from exclusive pregnancy news to every single Kardashian birth (11 and counting!). She resides in Northern Virginia with her family. People Editorial Guidelines Published on October 30, 2019 04:00 PM Share Tweet Pin Email Dave Grohl is rocking out in a much different (and more adorable) way than his fans usually see him. The Foo Fighters frontman and father of three, 50, makes a very special cameo on the Nick Jr. preschool series Ryan’s Mystery Playdate, in an upcoming episode titled “Ryan’s Legendary Playdate.” No doubt one of his big motivators to appear on the show? Grohl’s youngest child, 5-year-old daughter Ophelia Saint, a.k.a. Fifi, “a Ryan superfan” who joins her dad and the rest of the gang for a jam session. “Are you ready to rock?” Ryan asks her in a PEOPLE-exclusive preview clip from the episode. “I’m always ready to rock!” Fifi answers — a perfect response from the daughter of a famous rock star. Want all the latest pregnancy and birth announcements, plus celebrity mom blogs? Click here to get those and more in the PEOPLE Parents newsletter. Nickelodeon Dave Grohl and daughter Fifi on Ryan’s Mystery Playdate. Nickelodeon Kate Middleton Makes an Unexpected Cameo on Kids’ Show to Launch Contest for Her Garden Grohl lets the kids take the mic and play around onstage as he jams out on the drums — his instrument of choice oftentimes, and his main one during his days performing with Nirvana. The multifaceted musician then leads Fifi, Ryan and his friends in a rendition of “If You’re Happy and You Know It,” with a few slight changes to the lyrics. “If you’re happy and you know it, hug a bear,” he sings at one point — and a costumed bear appears, giving Fifi and Ryan a big squeeze to the delight of her dad. Dave Grohl on Ryan’s Mystery Playdate. Nickelodeon Dave Grohl’s Daughter Joins Him Onstage to Sing Adele’s “When We Were Young” “If you’re happy and you know it, pie your dad,” Grohl sings later, then realizes what just came out of his mouth and repeats, “Pie your dad?” Without hesitation, Fifi appears from behind the drum set and gently smashes a whipped-cream confection into the face of Grohl, who groans as his daughter laughs. With a face full of whipped cream, he continues, “If you’re happy and you know it, pie yourself” — and then it’s Fifi’s turn to turn her face into a dessert! Ryan’s Mystery Playdate‘s episode “Ryan’s Legendary Playdate” airs Thursday at 11:30 a.m. ET on Nickelodeon.