The model-and-TV presenter, who is currently romancing England rugby star Danny Cipriani, is reportedly hoping Billy will rethink their relationship after he sees her with another man.
Kelly is said to have told a friend: "If it makes Billy come to his senses, well, great. I would take Billy back in a shot, but we can't agree on anything."
The 28-year-old beauty - who was first spotted with Danny, 20, earlier this month as the pair enjoyed a romantic meal at London's The Ivy restaurant - has been telling pals she doesn't think the relationship will last.
According to New! magazine, Kelly said: "It is very complicated. I mean, he is great but it is not serious."
Earlier this month, Kelly revealed she was still in love with 42-year-old Billy, who she dated for around four years.
Kelly said: "The less time we spend together, the more complicated it's becoming. I see myself as single, yet I am very much in love with Billy."
While Kelly hasn't yet fully committed to her romance with Danny, the sportsman is already smitten.
Danny - who was recently pictured outside London's Chinawhite nightclub with British glamour model Holly James - said: "What a girl! I can't believe that we are an item."
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