A source told People magazine: "They sat side-by-side on a couch laughing
and chatting for about an hour.
"Then they were joined by a girlfriend of Sienna's but they kept flirting.
"Sienna stood in front of Josh while he was still sat down and he held onto
her thigh."
The group eventually retired to the hotel's poolside to drink cocktails.
Sienna, 25, split from boyfriend Jude Law in November and Josh, 28, is said
to have split from Scarlett Johansson, who he shared a New York apartment
with until late last year.
A representative for Sienna said: "They're friends, just friends. They were
just hanging out."

On Sunday NW Magazine, reported that Leonardo DiCaprio was set to go public with his new love Sienna Miller.

The actor reportedly dumped his girlfriend, model Bar Refaeli, for the blonde actress, who's finally ended her on-again/off-again relationship with Jude Law, 34.

Insiders say that Sienna, has been dating Leo, 32, despite telling pals that she would only date men her own age.

"They got on really well, though Sienna was adamant she never wanted to date an older man again after being dealt a blow with Jude," says an insider. "But as they spent more time together their feelings for one another blossomed."

"It's lovely to be here and see people you know but the whole process is genuinely quite scary

At the Golden Globes, actress Sienna Miller dismissed press reports romantically linking her to actor Leonardo DiCaprio.

She told red carpet host Ryan Seacrest there was "absolutely no truth in it".

"I haven't seen him in a year and half, we've just been catching up, we're buddies, old friends."