She can stand under his “Umbrella” any day! Matthew Morrison is gushing over his recent “Glee” co-star, Gwyneth Paltrow.

“Gwyneth Paltrow is a genius,” Matthew said, at an In Add Minus event in Los Angeles on Thursday. “Who knew that she was such a triple threat? Great dancer, great singer, obviously a great actress — I just had the best time.”

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Gwyneth appeared on hit FOX series on Tuesday, playing fun-loving substitute teacher Holly Holiday. The Oscar-winning actress performed a rousing version of Cee Lo Green’s hit, “Forget You,” then joined Matthew for a splashy mash-up of Rihanna’s “Umbrella,” and the timeless “Singin’ in the Rain.”

“Our set is kind of like a playground — especially [for] the ‘Singin’ in the Rain’ number,” Matthew said, of filming the aquatic-themed track with Gwyneth on a water-filled stage. “We were just having so much fun like, splashing each other, getting each other wet. It was fun!”

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Matthew, 32, who got his start on Broadway, has been making fans swoon since his 2009 “Glee” debut, and his charming appeal was made official this week when he earned a spot on People’s Sexiest Man Alive list.

“I don’t know how to think about it,” Matthew said of his new honor. “People think I’m sexy, I guess… Cool, I guess? I don’t know — it’s a little embarrassing!

“I thank my parents for this,” he laughed.

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