The Insider.com

Rihanna shared an Instagram photo on Saturday that could have acted as a book cover for Fifty Shades of Grey.

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The image is of the pop princess, 24, topless and donning a HUGE gold choker around her neck. Seeing as she and Brown, 23, are back together, it's safe to assume this may be from her on-again, off-again beau. After all, the caption to the racy picture reads: "He told me 'you better not give it away.'"

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The two recently made their romance public via the photo-sharing site. On Sunday, Brown posted a pic on Instagram of he and RiRi on a couch together with a caption that read: "What would music today sound like if these kids didn't exist?"

What are your thoughts on Rihanna and Brown's rekindled romance? Will this last?