Samantha Womack - who played baby-snatch mum Ronnie Mitchell on EastEnders - is to take part in a Mother's Day edition of Who Wants To Be A Millionaire?
The actress will appear with her mum Di on the live special edition of the quiz show on Sunday.
Other celebrities to take part in the ITV1 programme are Benidorm star Steve Pemberton and Coronation Street's Antony Cotton.
Each of the stars will be competing for a different charity when they face question master Chris Tarrant.
Womack said: "I'm really excited about appearing on the show - but not so excited about having to negotiate with my mother on live TV."
Cotton - who plays Corrie's Sean Tully - said: " I am excited and terrified in equal measure."
The show will be screened at 8.30pm.