Marc Anthony and Shannon de Lima have finally made thier red carpet debut.

While Jennifer Lopez and Casper Smart have been spotted all over the place filming music videos and attending Oscar after-parties together since she split from Marc, he's been keeping a relatively low profile ... until now.

J.Lo's ex hit the red carpet earlier tonight at the 47th Annual Country Music Awards in Las Vegas with his 24-year-old girlfriend, marking their first public appearance together.

Since they started dating, they've appeared together on Twitter and were spotted at a tattoo parlor back in January. Sunday night's appearance seems to make their relationship official.

Check out more CMA arrival shots above!

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