The ANGELS singer first met Mumba in Los Angeles in February (04) and was instantly smitten.
But the singer was reportedly wary of Williams' reputation as a womaniser and rebuffed his advances.
But his persistence appears to have paid off as Mumba has now admitted that a romance has blossomed between them.
According to one friend, "She might have played hard to get in the beginning, but Samantha is as keen as Robbie now."
The budding film starlet, who was in LA filming new movie BOY EATS GIRL is said to be taking things in her stride and has described her affair with Robbie as just 'a laugh' for the moment.
Robbie's last serious girlfriend was model Rachel Hunter but he has been single for over a year.
Despite his well-publicised flirtatiousness, the singer recently confessed that he'd like to get married: "If I could meet the right girl I'd settle down."04/07/2004 15:47