Katy Perry and John Mayer's friends want them to get engaged.

The 36-year-old "Wildfire" hitmaker is expected to propose to "Roar" singer in the near future. "It's inevitable," a source told E! News.

The insider said that the couple are "very serious" and added, "Everyone wants them to get engaged. They are so perfect together."

Katy recently gushed about her feelings for the singer-songwriter, whom she first started dating in June 2012: "I actually am dating my crush. I had a crush on him for a long time." She also insisted she loved being married even though she got a divorce. "Of course. I really loved it. It was a new, fun, exciting journey. But I like how I am now, and I think all things happen for a reason," she said.

John, who previously dated Jessica Simpson and Jennifer Aniston, presented the 29-year-old star with a heart-shaped ruby ring for Valentine's Day in Santa Barbara, California, earlier this year but a source insisted at the time that they weren't ready to tie the knot. "It's a one-of-a-kind Daniel Gibbings ring featuring a 12 carat ruby high-dome cabochon heart shaped centre, accented by two teardrop faceted sapphires and rubies, set in 20-carat gold," the insider said.