Julianne Hough’s put on the pounds since she started dating American Idol host Ryan Seacrest. And Julianne reveals to InStyle Ryan’s to blame!

When the couple finds time to spend together amidst their busy schedules, Julianne, who’s gained 20 pounds in 2 years, says she likes to cook for her beau.

And along with the food comes expensive wine!

“Now we always have great wine, and I can tell the difference. So I told him, “˜You ruined my life because I can’t go to a friend’s house and drink cheap wine anymore.’”

She also dishes to the mag that she and Ryan almost didn’t even date.

“I was reluctant because he is such an influential guy, and what if it didn’t work out?”

But things did work out.  The celeb couple have been dating for two years now.