Joel's skills were put to the test during a guest appearance on The One Show on Thursday (February 20) to promote this year's Sport Relief challenge, but presenters Matt Baker and Alex Jones asked about his hit ITV show too.
Matt and Alex even had their own celebrity Masked Singer contestant to test Dommett — though The Lion's costume wasn't quite as elaborate as Queen Bee or Daisy.
But when it came time to sing, The Lion belted out a version of Whitney Houston's banger 'I Wanna Dance With Somebody' that would have even impressed Masked Singer winner Nicola Roberts.
Joel had absolutely no clue who was under the Lion's mane — and guesses poured in from the One Show viewers: Frankie Bridge, Masked Singer judge Rita Ora, Steph McGovern or even Lord Sugar!
But the actual culprit was much closer to home for Dommett! The Lion revealed herself to be his close pal and former I'm a Celebrity: Extra Camp co-host Emily Atack!
"This is the weirdest thing I've ever done," she admitted after pulling off the Lion mask.
Unfortunately, Thursday's One Show was a rare chance to see Joel and Emily on telly together this year because ITV recently cancelled I'm a Celebrity's after-show Extra Camp because of high production costs.
"The show will no longer continue," Joel announced. "It's been a huge privilege to be a part [of] a show with such a rich history filled with amazing hosts."
The One Show airs Mondays through Fridays at 7pm on BBC One, while The Masked Singer airs on ITV.
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