Amid Rihanna's on-and-off relationship with rapper Drake, it seems that the Bad Girl singer has found ways to keep herself busy, sources say.

In Twitter, RiRi posted a series of tweets of what seemed to be lyrics from Nicki Minaj's latest project with hashtag #Barz. Fans were quick to speculate that the two artists might be lining up some collaboration work.

The two first collaborated in Nicki Minaj's single Fly from the album Pink Friday: Roman Reloaded. According to MTV, 31-year-old Minaj also used the same hashtag from a pencil drawing she posted on the social media site.

RiRi responded five days later saying:

"You gone make me a believer... even if that s*** ain't true #Barz."

"Politics is one bold move... Politics in lovin' you #barz."

"Your silver tongue is full of lies, with tricks and thrills and Bambi eyes."

"And I hate that all I hate just don't compare, because I love you #barz."

"Let me make it clear, ain't no place better, than where we're together... just me and my money #barz."

Rihanna also worked with Shakira on her self-titled album. Currently, she is preparing for a world tour together with rapper Eminem in August.