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Looks like things are heating up for Paris Hilton and The Hangover director Todd Phillips!

Sources confirm to X17 that the two are seeing each other, even though Paris recently told us she's not looking for a new man!

Hilton/Phillips have been spotted out together tons lately -- they were seen kissing at The Roosevelt Hotel last week, and we caught up with them Sunday night at a pre-July 4 party!

Paris, 30, wasn't hiding her face from cameras ... she seems proud of Phillips, 40, whose films also include The Hangover: Part II, Road Trip and Starsky & Hutch.