Rihanna reunited with her favorite songwriter Ester Dean to work on her highly anticipated eighth studio album over the weekend.

The Oklahoma-native musician previously teamed up with the Barbadian star on numerous chart-topping singles, including "Rude Boy," "What's My Name," "S&M," "Where Have You Been," "Talk That Talk" and "Right Now."

Dean took to her Instagram account on Friday to share a black-and-white selfie she took with RiRi in the studio, seemingly hinting their collaboration. "Caption This," she ambiguously wrote the following caption.

The duo's recent studio session follows Ne-Yo teasing teaming up with the "Diamonds" hitmaker. While sitting down with U.K. hit music radio Capital FM earlier this month, the R&B singer first admitted meeting up with Rihanna but insisted that they did not talk about music.

"I actually have seen Rihanna recently," Ne-Yo said. "The conversation wasn't really music, it was just reuniting and how you been. We didn't really talk music."

The "Let Me Love You" crooner, who previously collaborated with the "Stay" singer for emotional track "Hate That I Love You" off her 2007 third studio album "Good Girl Gone Bad," eventually claimed that she has some big plans coming up, hinting that he might be involved.

"I went into the studio for her not too long ago to do some stuff, I don't know what's being kept or whatnot," he said. "I noticed she's got a few things coming, she's got a new album in the works. She's doing a lot of stuff all at one time right now."

In addition, DJ Mustard revealed that he produced a track on the follow-up to Rihanna's 2012 platinum-selling "Unapologetic" in August.

"I got a song on her album already, but I'm tryna get some more," he told Rap-Up TV. "It's a ballad. It's not like anything you've ever heard from me before. Some new sh*t. New sound."