Secretive "Twilight" co-stars Robert Pattinson and Kristen Stewart are poised to go public with their not-very-secretive romance.

Sources say the couple will fess up when filming starts on "Breaking Dawn," the third in the trilogy of vampire movies.

The "Twilight" stars have driven media and fans wild for months with their on-screen, off-screen romance but they gave themselves away with unscripted appearances like this shot of them cuddling as they left a plane in November.

A source on the "Twilight" set said the stars and crew were thrilled for them.

"Rob and Kristen are very happy, and everyone that's part of the franchise is so happy for them," she said.

"They don't feel the need to hide it anymore."

The pair managed to hide on the tiny Isle of Wight for the New Year holidays only to get nabbed by a fan.

"Rob is a reluctant star," the source said. "He just wants a quiet English life."

He's not likely to get that this year with filming on the new movie likely to get split into two.