John Travolta Is in the Backstreet Boys?

6/5/2009 4:45 PM PDT BY TMZ STAFF
Here's John Travolta in his new movie "The Taking of Pelham 123" (left) -- and rehabbed 31-year-old Backstreet Boy A.J. McLean (right).

A.J. McLean and John Travolta

One of them is in costume.