Robert Pattinson and FKA twigs
Robert Pattinson is planning to ask FKA twigs to sign a prenuptial agreement to guard his $100m fortuneReuters/Getty

Robert Pattinson is allegedly planning to ask girlfriend FKA twigs to sign a prenuptial agreement before their wedding.

According to Hollywood Life, the 28-year-old Remember Me actor wants to keep his assets separate from the 27-year-old singer, whose real name is Tahliah Debrett Barnett.

According to The Richest, Pattinson's net worth at the moment is estimated at a $100m.

"Robert is putting serious consideration into inserting a prenup agreement in place for his marriage to FKA Twigs," an insider told the website.

"There's obviously a big difference in the wealth both Robert and FKA Twigs have attained in their careers. Robert wants to be careful, just in case it doesn't work out. He's worried about losing his millions should they ever divorce. He just wants to protect himself from the worst case scenario."

"After Kristen cheated on him with Rupert, Robert has had his struggles trusting anyone," the source added. "It really knocked his confidence and it's also a factor in why he's thinking about a prenup."

In 2012, Pattinson ended his relationship with American actress Kristen Stewart, his Twilight co-star and girlfriend of four years, after it was confirmed that she cheated on him with British director Rupert Sanders.

Stewart and Sanders, who worked together on Snow White And The Huntsman, were photographed kissing in the Hollywood hills.

The pair had patched up their differences and started dating again, and were spotted together during the Coachella Music Festival in 2013.

However, the two broke up in May 2013 after Pattinson pulled out of his 27th birthday celebrations, which had been planned by Stewart.