Heather just broke up with David [0] since she was still not really ready for something serious but it looks like her ex-husband Richie Sambora feels differently. Life & Style is reporting the two are engaged. They made a public appearance at the Fashion Rocks show last night. L&S reports [1]:

While Denise's rep was not immediately available for comment, these exclusive photos show her $100,000, 9.5 carat ring, which, according to an insider, Richie presented to her on Sept. 2.

“They were on their way to the Staples Center [in LA] to see the fights,” says the insider. “He got down on one knee in the back of the limo.”

What's interesting is that TMZ reports [2] that the couple also went public last night at the Fashion Rocks event but that Denise was not wearing any rocks on her hands. Hmmm.