Credit: Larry Busacca/Getty Images Photo: Katy Perry and John Mayer

When will we hear the roar of engagement news from Katy Perry and John Mayer?

Last summer, rumor had it John would propose to Katy around the holidays. That didn't happen, but in the fall a source said he will propose, it's "just a question of when."

That question is still hanging after Valentine's Day. According to E! News, Katy and John had dinner that night at Sunset Towers in Los Angeles, then went to the back room of Bootsy Bellows club in West Hollywood.

And, E! noted with photos, you can see a certain ring on her ring finger. It doesn't look like an engagement ring, it just looks like a gold ring. Still, Katy had a huge grin and didn't seem shy about showing the ring to the cameras. Check out a few pics.

A source told E! that, despite the ring, John hasn't proposed quite yet. But that doesn't mean things aren't going well for the couple. "They are really happy," the source said. "They had the most amazing date night. They had a private booth at Bootsy Bellows and were very happy just to be together. They were taking pics of one another and are head over heels. After a while, they had some friends join them and they spent the rest of the night dancing. They left as the club was closing."

Twitter isn't telling us much, except for this February 15 tweet from John: "I got the hottest girl in the game Pick in' my brain."

Katy and John have been dating on and off since summer 2012. Just last month, Life & Style said the couple flew about a dozen of their closest friends to Hawaii for a special trip. There was talk that it might be for a secret island wedding, but maybe not. Maybe it was just for fun. (We really need to get on that close friend list.)

So we're still on standby for this proposal. Come on, Mayer — say what you need to say!

Sources: E! News, Daily Mail, Twitter