Katharine McPhee is happily married, but that didn't stop Russell Brand from trying to charm the Smash star!

Monday on Late Night With Jimmy Fallon, Katy Perry's ex flirted pretty shamelessly with the 28-year-old singer-actress.

"Katharine is welcome to sit here," the 37-year-old British comedian quipped, placing the brunette beauty on his lap. Katharine went along with the playful advances to a point and was then comically alarmed with Russell tried to keep her from getting up.

"You're beautiful!" he gushed, before allowing her to take over the seat as he moved to the couch. "I'll just be here…with my sexual charisma."

Poor Russell!

Russell Brand, Katharine McPhee, Jimmy Fallon Show
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