Haylie Duff is expecting her first child.

The 29-year-old celebrity chef, who is singer Hilary Duff's older sister, has announced she and fiancé Matt Rosenberg will welcome their first child into the world next spring.

A spokesperson for the couple, who got engaged in April, confirmed the happy news to E! News and Hilary, who has son Luca, two, with estranged husband Mike Comrie, also shared her excitement on Twitter, writing: ''GUYS I'm going 2 be an auntie @haylieduff & @matt_sts are going to be the best parents to a sweet baby &luc will have a partner in crime (sic)''

Their new arrival is unlikely to disrupt their wedding plans, as earlier this year Haylie admitted she wasn't stressed getting married.

The 'Real Girl's Kitchen' host said: ''I really haven't had any time to sort of Google 'wedding dresses' and Pinterest boards and all the stuff that people I think normally do.''

But 'The Wedding Pact' actress is certain apparel entrepreneur Matt is the ''one'' for her.

She said: ''He just complements me so well. We're very different in a lot of ways. I think really when he became close with my family, and I saw how simpatico everybody was, that's when I was like, 'Okay, so not only do I love him, but they love him too.' And I feel like that's the way it's supposed to be.''

The couple celebrated their anniversary on November 22 and Haylie shared a romantic picture of them taken on a beach, with the caption: ''Happy Anniversary to the greatest man I know. I'm lucky to be yours.''