Jessica Simpson and John Mayer hooking up again?

Jessica Simpson and John Mayer may be hooking up again.

According to TMZ spies chilling at the posh Four Seasons Hotel in Beverly Hills Monday night, John Mayer invited a TMZ spy to his room to "talk." She declined

Jessica Simpson arrived at the bar a short time later and saw friend and producer Romeo Antonio sitting at a table. Jessica approached Antonio and chatted for a bit. Antonio then left the table to use he bathroom and while he was in the restroom, Mayer walked in. A very serious Mayer asked if there was anything going on between Antonio and Simpson. Antonio said no.

Mayer then went back to the bar, chatted up Simpson for approximately 10 minutes and then the two left the bar together and took the elevator upstairs..

Newly-divorced Simpson recently admitted that she has insomnia problems because she likes to plan her dreams: "I start thinking about what I wanna dream about... It's called lucid dreaming. I'm a little sexually frustrated right now, so if you tell yourself what you're gonna dream about then you can have a really great dream."