The Manchester United striker - currently in LA on an undisclosed business trip - arrived at trendy hotspot Villa in the early hours of Wednesday morning.
A source said: 'Paris was all over him. The moment he arrived, she went over to his private table.
'At one point, she pushed her chest together and made a point of trying to snuggle up against him.
New admirer: Seductress Paris Hilton worked her charms on an unimpressed Ronaldo last night in Hollywood
'But Ronaldo clearly wasn't interested in Paris. He turned his back on her.'
According to reports, the 23-year-old Portugese star is a single man after splitting from model Nereida Gallardo, 25.
And heiress Paris, clad in a peach-coloured dress, was clearly impressed by his charms.
The onlooker added: 'Every girl in the club was checking him out but Paris couldn't take her eyes off him.
'You could tell he enjoyed the attention but he didn't really want anything to do with any of the girls.
Single and ready to mingle: The footballer let his hair down at trendy Hollywood club Villa
'He just sipped vodka soda in the corner of the club with his friends.'
Flanked by four or five male friends, Ronaldo arrived hobbled in on crutches just after 11.30pm.
Earlier, he had enjoyed a business dinner with around nine associates at Hollywood steak restaurant STK.
A fellow diner said: 'He is obviously in LA on business.
'He looked very serious over dinner and spent the entire time talking to the men in suits.'
The onlooker added that Ronaldo is being accompanied by a glamorous female assistant, who is apparently helping him recuperate from injury.
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