Robin Thicke cheating on Paula Patton? 'Blurred Lines' singer dances, flirts with sexy 'mystery girl' at Paris nightclub behind wife's back (again)? [PHOTOS]

Following Robin Thicke's rauncy performance alongside Miley Cyrus at the 2013 MTV VMAs, the "Blurred Lines" crooner was spotted pinching the butt of Lana Scolaro. Thicke's longtime wife Paula Patton didn't seem to mind... but will she this time around?

UPDATE: Robin Thicke & Paula Patton cheating scandal, couple shows no signs of trouble on Instagram after 'Blurred Lines' singer flirts with sexy beauty in Paris [PHOTOS]

The 36-year-old singer performed at Paris' popular Club 79 on Saturday (January 18) and joined partiers on the dancefloor afterwards. That's where he was spotted getting down-and-dirty with a sexy "mystery girl."

Thicke apparently had a great time, smoking and drinking throughout the evening. One specific fan was glued to his side the entire night - she was young, flirtatious, and gorgeous. The two got a little too close for comfort (considering Thicke has a son with Patton, who he's been married to since 2005). Check out the steamy photos here.

Nothing "inappropriate" appeared to happen, but still, Patton was nowhere in sight.

Thicke (sweaty and maybe a little inebriated) danced the night away with a slew of fans, but the curly-haired beauty was never too far from his arms. At one point they embraced and appeared to give each other a kiss on the cheek. The woman was also spotted suggestively whispering in Thicke's ear.

Should Patton be worried?

The couple seems to have a strong, steady relationship. They were high school sweethearts and have been together ever since. According to Thicke, his hit (controversial) song "Blurred Lines" is even about his wife:

"She's my good girl. And I know she wants it because we've been together for 20 years."

But is Thicke pushing things a little too far with his flirtatious behavior? What do Mstars readers think?