Ryan Phillipe & Ashlee Simpson - SERIOUSLY???

So I know Ryan Phillipe and Ashlee Simpson met out a few weeks ago... and ended up talking for a few hours at a club... but what I didn't hear until now is that they WENT BACK TO ASHLEE'S HOUSE TOGETHER!!!

According to Female First...

"When Ryan and his friends arrived they were shown to the only table with any space left — where Ashlee and her friends were sitting.

"He couldn't keep his eyes off her in her very figure hugging little black dress. They seemed very into each other. Ashlee was really excited. You could tell she had a huge crush on him."

After flirting for hours, onlookers claim the couple disappeared to a private area upstairs, called The Library, at around 2am.

The source added: "They were up there for over an hour and came back looking dishevelled. We knew something went on.

"They took separate cars and met at her place. He spent the night! Ashlee is keeping quiet and just said how hot he was. They really hit it off. I think they will hook up again."