Madonna has set tongues wagging about her rumoured relationship with baseball 'boy toy' Alex Rodriguez after 'serenading' him during a concert.

The Yankees slugger was given a VIP front row seat at Madge's Miami, Florida gig last night, and onlookers say the divorcee appeared to drop a major hint about her rumoured dalliance with the star.

Word is the singer and the baseballer were beaming at each other during the star's stage extravaganza, and at one point she fixed her gaze directly on him before launching into a slushy ballad.