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They still haven't confirmed they're an item, but after all the time they've spent together lately, do we really believe that Benji Madden and Holly Madison are just "adventure buddies"?!

Benjolly were first spotted together last December, and since then they have hung out in Las Vegas and Los Angeles, and over the past few weeks Hugh Hefner's former number one lady has dropped all sorts of hints on Twitter that there's something romantic brewing between the two of them. This morning we snapped the duo going for a stroll on Melrose, and even though Holly's rep insists the two are "just friends," it looks like there was some sort of a cinco de sleepover last night!