It's been reported that Bridesmaids' star and co-writer Kristen Wiig is set to walk down the aisle with her long-term boyfriend Avi Rothman.

According to TMZ, the 45-year-old actress, comedienne and writer, and Rothman - who's also an actor and writer - are said to have been engaged for several months following three years of dating.

Kristen sparked engagement rumours in May after she was spotted wearing an eye-catching diamond on her ring finger. 

The Ghostbusters star attended the Booksmart screening in LA with Lisa Kudrow where she was spotted wearing an engagement ring.

Lisa Kudrow and Kristen Wiig at the the Booksmart screening

The couple have kept their romance away from the spotlight since they were first spotted together in May 2016.

Wiig has been married before. She married actor Hayes Hargrove in 2005, but they divorced just four years later.

In an interview with Stella magazine, she proclaimed unlikely the idea of a second marriage, stating: "I probably won't ever get married [again]; it's not something that I would want to do.

"I think women put that pressure on themselves, maybe even more than society does, but, if you're the single girl at the wedding, you know someone is going to ask you when you're going to get married."