"It's a reaction I don't think anyone will expect."

EastEnders' Tilly Keeper has teased Louise Mitchell's surprise reaction as Sharon Mitchell and Keanu Taylor's affair is set to be exposed this Christmas. The actress admitted she thinks viewers are going to be surprised by the new mum's reaction when she finds out her fiancé had a fling with her step mum. Louise is looking forward to her first holiday season with Keanu and their baby daughter, Peggy - but things won't go too smoothly over the holiday season. Sharon and Keanu's secret is set to be revealed o Christmas Day. However, Tilly hinted that there may be more twists to the story than fans expect. "It's a reaction I don't think anyone will expect," she told The Mirror."Of course, she's a young girl and her fiancé has cheated on her, so she's obviously devastated." Louise's suspicions are set to be raised beforehand, with both her father Phil and brother Ben asking her about Sharon's behaviour near the end of last year.

"It definitely sparks a suspicion," Tilly said. "Louise is so caught up in her own life and drama so when that reality is brought to her again, it does spark something but she doesn't want to play on it too much because she wants to have the best Christmas with her baby girl."

However, she admitted there is an "underlying tension" after she starts to remember her own suspicions from the last year.

"She's got that kind of scheming side to her and she knows how to manipulate people. She's definitely trying to manipulate the truth out of both parties so she's playing the field between Sharon and Keanu by separately quizzing them about last year," Tilly continued.

"But with every answer they're giving her, it's feeding the fact that she's really trying to deny the truth even to herself."

Tilly announced earlier this year that she would be leaving EastEnders after four years. You can read more about that here.