BRAD & JEN'S SECRET DAUGHTER!

Stars dote on look-alike as she graduates college

BRAD PITT and Jennifer Aniston, who were childless during their five-year marriage, have a “secret daughter” called Sydney — and she’s the spitting image of the movie hunk!

Sydney is actually 56-year-old Brad’s niece, whose dad, Douglas, 53, is the star’s younger brother, but her famous uncle “loves her like his own” — and Jen does, too, says an insider.

“They like to think they’d have had a girl like Sydney,” dishes the source. “It also helps their little family fantasy that Sydney looks just like Brad as a youngster.”

Adds the tattletale: “It helps them understand what it would’ve been like if they’d had a child.”