• Robert Downey Jr.'s prank Cillian Murphy
  • Downney Jr. and Murphy hold hands
  • At the Palm Springs Film Festival Awards

The Palm Springs Film Festival Awards were on fire Thursday night, and not just from the desert heat! Hollywood's very own Robert Downey Jr. (58), known for his iconic role as Iron Man, brought the house down with a side-splitting prank on his 'Oppenheimer' co-star, Cillian Murphy (47). The Cork-born actor, fresh off his Desert Palm Achievement Award win for his portrayal of J. Robert Oppenheimer, was ambushed with a "No Irish Jokes" sign courtesy of Downey Jr.

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IHG Hotels & Resorts Sponsors 35th Annual Palm Springs International Film Festival
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The biopic's Lewis Strauss, aka Downey Jr., got down on one knee in a playful gesture, slapping the handwritten note on Murphy's chest. Murphy, looking sharp in a classic black tuxedo, couldn't help but let out a stream of giggles, clutching his quirky glass award. Meanwhile, Downey Jr. rocked a pale pink double-breasted suit, paired with some laid-back white trainers, because who says you can't mix comfort with style?

The dynamic duo were the life of the party, their smiles as bright as the camera flashes on the red carpet. Our favorite moment? When they held hands on the red carpet! And let's not forget, Murphy's stellar performance has him tipped for an Oscar nod – talk about a winning streak!

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35th Annual Palm Springs International Film Awards – Arrivals
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But the night wasn't just about these two jesters. Carey Mulligan (38) dazzled in an elegant gown, clutching her International Star Award trophy, while the afterparty buzzed with the likes of Danielle Brooks and the musical powerhouse Billie Eilish.

Back to our pranksters, though. Downey Jr. proudly watched as Murphy delivered his acceptance speech, the bond between these A-listers clear as day. And with the Golden Globes right around the corner, the buzz is all about potential wins for "Maestro" and the controversy surrounding Bradley Cooper's transformation for the role.

So, who says award shows are all pomp and no play? Downey Jr. and Murphy sure know how to keep things lively, proving that a little humor goes a long way in Hollywood!