Hollywood actress Rose McGowan and her boyfriend Robert Rodriguez, whom she met while shooting "Grindhouse" which Rodriguez directed, sparked some engagement rumors after McGowan was spotted wearing a large diamond ring on her wedding finger.

According to People magazine, a close source to the couple, who met for the first time at Cannes in 2005, confirmed the reports about their engagement.

Last year, after McGowan met Rodriguez she said: "He's my best friend," adding, "We instantly became really good friends." The 39-year-old director was soon divorcing his wife of 16 years, Elizabeth Avellan, with whom he has five children.

In May, the couple went public with their relationship, denying Rodriguez cheated on his wife while on the set of "Planet Terror," claiming they split way before the filming had started.

"It was the worst-kept secret on the set. They were going off to his trailer, having meals together," a source was quoted by Page Six as saying. "Rose thought some of the crew were treating her differently, and the attitude was, like, well what do you expect when you're [bleeping] the director?"

The 34-year-old actress was previously engaged to rocker Marilyn Manson for two years, before ending their relationship due to their very different lifestyle. When questioned some more by Howard Stern, she admitted that drug use was a big part of that lifestyle.

"There is great love, but our lifestyle difference is, unfortunately, even greater," McGowan explained in a statement in January 2001.