The Twilight star is said to be head over heels with singer girlfriend     photo:thegloss.com

Things could be looking to get a whole lot more serious between Robert Pattinson and his new girlfriend FKA Twigs, according to a new report.

The 28-year-old star and The Two Weeks singer have reportedly been wearing promise rings that show their commitment to one another.

"He wants to marry her," a source told People magazine, saying that the Twilight actor was "much more calm and happy than before."

"They are inseparable when they are together. They live at his house," the insider added.

Robert and the singer started dating following his messy split from Kristen Stewart after three years.

While he's kept a cool silence over his private life, FKA Twigs has admitted that she's found the fame hard to deal with but it's a compromise she makes for the man she loves.

Last week, Robert and FKA Twigs were spotted hand-in-hand as they left a BRIT Awards after party.

The happy couple looked to have enjoyed a fun evening on Wednesday as they continued the night at the Warner Music bash after the annual ceremony.