United Kingdom, March 24 -- Hilaria Baldwin threatened to end her relationship with Alec Baldwin if she didn't get along with his daughter Ireland.

The '30 Rock' star was already dad to Ireland, 29, from his marriage to Kim Basinger when he struck up a romance with Hilaria, 41, who has revealed she was determined to walk away from Alec if she was unable to forge a bond with his daughter.

During an episode of the couple's reality show 'The Baldwins', Hilaria explained: "I feel like it is unique for a stepmom and stepdaughter relationship. First of all, I am 11 years older than her [Ireland], I didn't raise her and we find tremendous humor in that ...

"Before I was her stepmother, when I met her I told Alec: 'If she doesn't like me, I am...