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Joey's gone gray!

Six years after the finale of Friends -- and four after spinoff Joey ended -- fans might be shocked to see Matt LeBlanc, now 43, sporting silver hair.

But LeBlanc has a big secret bottled up. "I dyed my hair the whole time on Friends," he admitted Thursday at a Television Critics' Panel in Beverly Hills for his new Showtime series Episodes.

"I just was sick of doing it," LeBlanc explained of darkening his locks.

And his 4-year TV hiatus was just what the doctor ordered, he said. "When Joey ended, I took a lot of time off...I just really was kinda burned out. I just wanted to be a dad."

LeBlanc has a 6-year-old daughter, Marina, with his ex-wife Melissa McKnight. "We have a great bond, and it's the best thing in my life."

On Episodes, LeBlanc plays a character named...Matt LeBlanc. "It's a character," he added. "It's not me. It's the public's perception of me more than really me."

Will LeBlanc reunite with Friends cohort Courteney Cox for a cameo on her ABC hit Cougar Town? "I haven't been asked!" he admitted, laughing.