Madonna performs on stage during her "Sticky and Sweet" tour at Morumbi stadium in Sao Paulo December 18, 2008. [Agencies]

Madonna is reportedly dating a Brazilian model to make Alex Rodriguez jealous.

The 50-year-old singer, who has been romantically linked to Alex and Jesus Luz since her split from husband Guy Ritchie, is keen to show Alex - nickname 'A-Rod' - what he is missing by not fully committing to her.

A source told the New York Daily News newspaper: "Madonna likes to be in control, and she hasn't been able to completely control Alex yet. "Jesus has been much more attentive than Alex recently. If A-Rod will commit to Madonna, then he'll win her affections. But it's not like he's giving her a diamond ring. Neither he nor Madonna is 100 per cent committed to each other yet."

Baseball player Alex, 33 - whose rumoured romance with Madonna began last year - is furious the 'Hung Up' star has been spotted out with 22-year-old Jesus, claiming it has damaged his reputation.

The source added: "Alex is well aware that Madonna is out and about with Jesus, and he isn't happy about it. It's embarrassing for him because he and Madonna have been so publicly linked, and now it looks like he's been dumped for a younger stud."

Madonna is not believed to be serious about Jesus, but is enjoying the attention of the young hunk.

The source explained: "Jesus comes and goes, but he never stays at her house. He's certainly not moving in. It's not like Madonna is going to marry Jesus. He's keeping her warm at night."

(China Daily/Agencies February 5, 2009)