The Bachelor's Courtney Robertson Models Engagement Rings!

Before Courtney Robertson was competing for an engagement ring from The Bachelor's Ben Flajnik, she modeled them for work!

In exclusive photos obtained by Life & Style, the 28-year-old Bachelor finalist is seen modeling gorgeous engagement rings for the Hearts on Fire diamonds print advertising campaign.

"She did this a few years ago," an insider tells Life & Style.

But that's not all she's modeling! In the racy ads, the brunette beauty also lies on top of an attractive male model and even shares a very passionate kiss with him.

On its website, Hearts on Fire says it offers "The World's Most Perfectly Cut Diamond."

As of the latest episode of The Bachelor, which aired on Feb. 20, Courtney is one of the three finalists still in the running for Ben's heart.

We wonder how Ben will feel about these ads!