The Australian singer split from runway beauty Hadid in May (15) after dating her on and off for two years, but it appears the 18 year old is single no more after spending America's Independence Day weekend (04-05Jul15) with men's magazine stunner Carmella Rose.

The rumoured new couple was photographed leaving Hollywood hotspot Bootsy Bellows arm-in-arm on Sunday (05Jul15), while Rose shared a snap of the pair with a friend at popular sushi restaurant Nobu Malibu on Instagram.com on Monday (06Jul15).

Simpson and Rose, who has posed for Maxim magazine, were also spotted shopping together in Los Angeles on Wednesday (08Jul15).

They have yet to comment on the romance speculation, but if the news is true, Simpson will at least have Rose on hand to look after him after pulling out of a TV interview on U.S. news show Access Hollywood Live on Thursday morning (09Jul15).

Simpson informed producers he had "the throw-up bug" and was too ill to appear on the programme shortly before cameras began to roll.

Meanwhile, Hadid has also put her split from Simpson firmly in the past after reportedly embarking on a relationship with Joe Jonas.