Paris Hilton and boyfriend River Viiperi are too hot for words! We don't blame him for not being able to keep his eyes off the stunning blonde heiress.

The sexy twosome arrived in Maui just yesterday, but they wasted no time getting out into the gorgeous Hawaiian sun ... and of course, into their swimsuits. Gotta say ... Princess P's bikini bod has never looked hotter.

A guest, who is staying at the same hotel as the couple, tells X17online exclusively:

    "Everyone couldn't stop staring at Paris and her boyfriend when they walked to the pool. We were so excited to see her in person. The hotel guests were commenting that they're the sexiest couple they've ever seen. Paris was so nice to take pictures with everyone who went up and asked."

We have a feeling these two lovebirds are going to have a blast on their mini-vacation.