Mariah Carey — My Gimp Arm … IS FABULOUS

This is painful … Mariah Carey was so self-conscious about wearing a sling on stage this weekend in NYC, she tried to disguise her broken wing with ridiculous fashion accessories — but it completely backfired.

Mariah — who dislocated her shoulder while filming a music video earlier this month — performed at the MLB All-Star Charity Concert Saturday night in 3 different outfits … which included 3 matching sling disguises, including a weird superhero feather arm, and something that resembled a giant Q-tip.

The problem … rather than divert attention away from her injury, the disguises made it way more obvious.

A giant Q-tip does sound very useful though.