Britney's Rehab Tennis Partner Comes Forward

Remember these pics of Britney Spears playing tennis in rehab? Apparently the guy is ready to milk the experience...

Musician Howie Day's publicist wrote to Page Six to tell that he was the guy playing tennis with Brit at Promises rehab center.

"Day is evidently being treated at the facility, and his rep informed us, 'He is promising to finish his next album when he emerges.' "