WATCH: Bikini-clad Rumer Willis straddles shirtless model and squirts sunscreen all over him!

Rumer Willis has been on our radar for a while but this video cements her in TheFIX's cool chicks to watch.

In this crazy clip, created by her director pal Jake Wilson, Rumer and a group of friends parody Ariana Grande's 'Problem'... but sing about SPF instead. The message: get covered people.

Sounds lame but is in fact pretty awesome with Rumer, 24, wearing a string of risqué bikinis as she squirts some seriously hot men in sunscreen.

Then there's some bumping and grinding in a swimming pool, straddling of a hot model and a whole lot of sunscreen being squirted around. Hot!

Compare it to Ariana's much tamer 'Problem' clip below...