We knew the couple was getting close to tying the knot, but are they already planning the wedding?

Paris Hilton may have quietly gotten engaged to boyfriend Doug Reindhardt. During an acceptance speech for an award for her charity work, the heiress said:

“I’d like to thank my future sister-in-law Casey Reinhardt.

A source added:

At one point, Paris reached for Doug’s mom’s huge wedding ring. She looked like she was in awe.

Last month, Paris wasn’t so secretive about the fact she wanted to spend the rest of her life with the former Hills star:

I wouldn’t rule out a wedding in 2010. With how amazing everything is going between us, I see a very bright and happy future. He’s taught me how real love can feel. Doug’s taught me how to grow up and become more domestic, as in not going out as much as I used to.

The two had a brief split last August, but are now completely obsessed with each other again.

[Image WENN]