Troubled Backstreet Boy A.J. McLean has extended his stay in rehab after being told he needs more treatment for booze addiction and depression.

The hunky pop star, 23, entered a 30-day program and was originally expected to be released later this week. But McLean's doctors urged him to remain, his fellow band members said. 

The delay means the Backstreet Boys will have to postpone an extra 10 shows on their American tour in addition to the 19 dates they've already had to reschedule. 

Concerts in Washington and Los Angeles have been canceled altogether. The boy band's Sept. 4 show at Nassau Coliseum and Sept. 7 gig at the Meadowlands are unaffected. 

"A.J.'s initial treatment is going very well," Backstreet Boy Kevin Richardson said. "His doctors have suggested it would be in A.J.'s best interest to take an additional two weeks in transitional care." 

Backstreeter Nick Carter told the BBC: "We truly want to thank our fans for standing with us through this. And we know that it will be worth the wait."

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