The blonde beauty, who has just landed her own show 'Real Girl's Kitchen' on the Cooking Channel, shared the news on her blog today, reported Contactmusic.
"This week has seriously just become the best week of my life! As if announcing The Real Girl's Kitchen TV show wasn't enough, Matt just took me by total surprise and proposed... On April Fool's Day of all days! The moment was genuine and sweet (like him!) and I couldn't wait to say yes!" she wrote.
The 29-year-old actress and Rosenberg have been together for the past one and half years.
Haylie's engagement news comes just three months after her younger sister Hilary announced her split from husband Mike Comrie after three years of marriage.