The rugby player, who moved to Australia last year to join the Melbourne Rebels, was spotted with Miss Universe Australia Campbell at Melbourne's Eve nightclub on Saturday night.
One onlooker told The Daily Telegraph that the couple were "all over each other" and Cipriani looked happy despite his team being beaten by the Highlanders the previous day.
Cipriani was believed to be seeing Aussie singer Tamara Jaber following the breakdown of her marriage to Kyle Sandilands last year. Before that, he reportedly split from British model and actress Kelly Brook because his female admirers became "too much" for her.
Brook recently announced that she is expecting her first child with partner Thom Evans. Cipriani said: "I'm really happy for her. She will be a great mum."
Campbell attended last year's Brownlow Medal event with Sam Newman's son Geordan after approaching radio star Eddie McGuire to help her find a date. McGuire set her up with Hawthorn footballer Brad Sewell but he later cancelled due to food poisoning and Geordan stepped in.