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A tweet from Rihanna has led to some speculation about a possible collaboration with Lady Gaga. 

On Wednesday, the "Diamonds" singer wrote that she just "recorded a #monster hook for one of [her] favorite artists."  She added, "That's all I can give you..." 

Many are taking her use of the word "monster" as a hint that Gaga could be her secret duet partner, as the star is also known by her nickname the "Mother Monster."  Gaga's new album ARTPOP is set to drop in November. 

After a quiet summer wrapping up her "Diamonds" tour, it looks like Ri-Ri could be gearing up to release a new single. 

She also tweeted that she's preparing to shoot a video for the song "What Now," off her most recent album Unapologetic.

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