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So is THIS where he's going to pop the question? Judging from their PDA at LAX last night, we wouldn't be surprised if Doug's got something special planned for his lady love this Sunday!

Last night Paris Hilton and Doug Reinhardt jetted off to Rio, and the heiress has been tweeting nonstop since she landed. Looks like someone's going to have a blast at the Carnival this weekend! Keep us posted P!