{blackbabes} Is Rihanna struggling to produce a hit song?

Rihanna is back in the studio recording her upcoming album, "#R8," because she's struggling to produce a radio hit, a source exclusively tells Page Six.

"The singles haven't caught on. She'll be fine because she's Rihanna — but it's not a good thing that the songs haven't stuck."

Rihanna kicked off this year with her single "FourFiveSeconds," featuring Kanye West and Paul McCartney, and subsequently released "American Oxygen" and "Bitch Better Have My Money." She has yet to announce an official release date, but the album was due in late spring, our source said.

Another insider, however, adds she's working hard on the project and she rushed those singles out because she wanted her fans to hear the new music.

"She released them because she felt really passionate about [them] and felt an urgency to get them out to her fans," said the source. "This isn't going to be another 'Diamonds' . . . She's never not in the studio. It's not her going back in. She never stopped."

RiRi earned her 23rd No. 1 dance single this month with "BBHMM."