Paris HiltonIt was only on Tuesday that Paris Hilton was gushing about being back together with ex-boyfriend Stavros Niarchos but it seems they’ve had an argument already.

The couple got back together recently but reportedly had a bust-up at P Diddy’s “White Party” in St Tropez when Stavros thought Paris was flirting with the host and ignoring him.

An onlooker revealed: “Paris was clapping at Diddy’s trampoline antics while Stavros was on the other side of the pool glaring at her.”

“He began texting Paris to come over, but she refused, sending him harsh messages on her diamante-covered Blackberry.”

“Eventually she stormed over and yelled, ‘Don’t you trust me? Get over it!’”