His biggest cheerleader! Jennifer Lopez declares her love for beau Alex Rodriguez as she sports his team's hat during sizzling Las Vegas show.

When Jennifer Lopez is in love, she shouts it from the rooftops.
The 48-year-old singer paid tribute to her boyfriend Alex Rodriguez when she wore a gold-studded New York Yankees flat bill hat for her Calibash Las Vegas performance on Saturday night.
Lopez was a vision on the T-Mobile Arena stage in a black leotard, fishnets, thigh high boots, and a zippered sweatshirt.