Rihanna's fall RiRi Hearts MAC cosmetics collection has been revealed, and the singer also shared the sexy photo of herself promoting the range, rocking her signature pixie, like RiRi of old. She also tweeted about hitting the studio for a "monster" collabo, which set off alarm bells that it was with Lady Gaga.

The MAC pic is as hot as the sun, right? We love the pink, liquid-like, mirrored bra she's wearing and the matte, stained, purple lip she's rocking and those sculpted cheekbones. It's also proof that she needn't go topless to show how sexy she inherently is.

The collection mixes classic fall shades in lipsticks and glosses, packaged in rose gold cases. RiRi song titles factor into some of the products, like the Diamonds Cream Colour Base and Powder Blush in Bad Girl Gone Good.

See her Instagrammed shot, as well!

Below is her tweet about studio time.

Using the term "monster" does not prove that she worked with Gaga, and we've never heard RiRi say that she is one of Gaga's biggest fans, so we're not so sure that the leap of faith and assuming this hook was with and for Gaga is the right way to go.

But you never know. Gaga is so closely associated with the term "monster." And then RiRi did reference her Navy, so using terms for both of their fanbases might make this a coded message.

What do you guys think?