Alex Rodriguez is Madonna's new water boy!

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Alex Rodriguez is officially Madonna's water boy.

The New York Yankees slugger handed Madonna a bottle of (probably cabala?) water after she sang her second song before a sell-out crowd in Miami's Dolphin Stadium Wednesday night.

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And that one thoughtful, loving gesture was the very public admission of their long-rumored love affair, made just a week after her quickie divorce from Guy Ritchie.

According to E!, the lovebirds landed in Miami Monday and spent Wednesday hanging around town with Madge's party promoter pal Ingrid Casares, who reportedly introduced the pair.

Madonna, 50, was 2½ hours late to start her Miami Sticky & Sweet concert.

But she sang and danced from 10 to midnight and A-Rod, who had spent Tuesday with his family, stayed for the whole concert.

After all, he's now her #1 fan!

Photos: Madonna rules the stage and A-Rod is all agog over his Lady Madonna at her concert Wednesday night. Isn't love grand? We give it 10 years.... Credits: WireImage.

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