They are not. Iirc, she has since had them removed, because even she realized how idiotic the balloons looked, tacked on her skeletal frame. Victoria Beckham (the former “Posh Spice”) rather defies comprehension as an object of male lust, because she has the figure of a concentration camp corpse, dresses like she’s going to her own funeral, and always has an expression like she ran over her dog on the way to an IRS audit.
Perhaps it’s just that she’s rich.
Some men find money attractive - in fact some women do, also.