Man, nothing. Let her decide to be sexy. But if it's a corporate "sex sells" kind of thing, or part of the cultural standardization and internalization of female objectification, then she shouldn't have to.
It's a double standard too-- I think there was a Marina and the Diamonds video that featured a bunch of scantily clad backup dudes and the media went apeshit because men still aren't allowed to be objectified in our society.
of course she shouldn't have to, but i don't think rihanna or beyonce are exactly beholden to what the corporations want at this point...Rihanna's "Pour It Up" video is a brilliant inversion of masculinity into a female lens, idk idk people much smarter than me talk about this a lot.
and yeah, of course, i've seen that video. dont like the song/her but i liked its subversion of tropes