Hey, Princess … WANNA RACE?!!

Conor McGregor was rubbin’ elbows with ROYALTY on the French Riviera on Monday … racing water bikes with Princess Charlene of Monaco and the pics are awesome.

The two got in a workout while Conor and his family are in the area on vacation. Afterward, their families — including Prince Albert — hung out together on shore.

“A Great day racing the water bikes with Princess Charlene of Monaco,” Conor said.

“A phenomenal athlete and Olympian, we are teaming up for a 180km voyage in September to raise awareness in water safety. I cannot wait!”

It’s true … Princess Charlene is one hell of an athlete herself — a former Olympic and World Champion swimmer!

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In fact, she competed for South Africa in the 2000 Olympic Games in the 4×100 relay, fishing behind Team USA (led by Olympic legend Amy Van Dyken).

She retired from competitive swimming in 2007 — and now focuses on various philanthropic efforts including water safety and the Special Olympics.

McGregor was clearly impressed with the water bike workout — saying he will now incorporate the exercise into his McGregor F.A.S.T. training program.

“Thank you for the great day for my family Your Highness,” McGregor added … “In aid of the Princess Charlene of Monaco foundation.”

Maybe he’ll stay retired after all?!