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Rap & B: When Singers Try to Rhyme - We already knew Chris Brown occasionally fancied himself a rapper, with last year's hit "Look at Me Now" the most prominent example. But now he's taking his MC ambitions a little itty-bitty step further by taking his beef with Drake from the club to the mic. He dropped a verse over Chief Keef's "I Don't Like" taking issue with Drake, his crew's alleged bottle-throwing ways—and his eyebrows. But Breezy isn't the first R&B singer-turnt-rapper (word to T-Pain). Click on for a look at other notable crooners who've tried their hand at rhyming. —Alex Gale (Photo: Kevin Winter/Getty Images)

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Trey Songz - Last year, Trey Songz dropped a a mixtape that featured him rapping over borrowed instrumentals on #Lemmeholdatbeat2. He even boasted, "I rap better than most rappers," at the time.(Photo: Skip Bolen/WireImage)

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Bobby Brown - We'll always have a soft spot for Bobby Brown's raps about proton packs and ghost slime from "On Our Own," his hit single off the Ghostbusters 2 soundtrack.(Photo: Courtesy MCA Records)

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R. Kelly - R. Kelly has always blurred the line between hip hop and R&B, but he really went for it on 2008's "I'm a Beast," dropping a verse that included several subliminal shots at Ne-Yo. Let's just say he should've kept this one trapped in the closet.(Photo: Larry Busacca/Getty Images)

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Omarion - Omarion dropped a mixtape with DJ Drama this year, The Awakening, which included the song, "Luke Skywalker (Bulls---tin')." The song featured the former B2K singer spitting alongside Method Man. No, we don't get it either.(Photo: Adrian Sidney/PictureGroup)

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Mary J. Blige - You can't really be mad when the Queen of Hip Hop Soul drops a verse. She's been killing it since 1993, when she rapped alongside Grand Puba on the classic remix to "What's the 411." Check her Yo! MTV Raps performance if you don't believe us.(Photo: Kevin Winter/Getty Images)

Photo By Photo: Kevin Winter/Getty Images

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Ryan Leslie - The talented singer-producer's third album Les Is More included the song "Joan of Arc," which surprisingly featured Leslie ably rapping the verses and singing the hook. (Photo: Elizabeth Lippman For Stacie Gillian)

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Justin Bieber - Justin Bieber turned heads last year when he debuted his rap alias Shawty Mane and leaked a video of him rhyming over Cam'Ron and Vado's "Speakin' Tungs." Stick to your day job, Biebz—it's not like it isn't a good one. (Photo: Michael Underwood/PictureGroup)

Photo By Michael Underwood/PictureGroup

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Ne-Yo - In a move that defined the term "SMH," Ne-Yo kicked a rhyme dissing Chris Brown over Lil Wayne's overused-and-abused "A Milli" in 2008.  (Photos: Adrian Sidney/PictureGroup)

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Bell Biv Devoe - Bell Biv Devoe's 1990 classic "Poison" was one of the first examples of R&B singers crossing over to the rap world—and two decades later, it's still one of the best. (Photo: Kevin Winter/Getty Images)

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Tyrese - Perhaps inspired by the shapeshifting robots in his The Tramsformers movies, actor-singer Tyrese confused everybody when he unveiled his alter-ego Black Ty and started trying to rap. We'll stick to Megatron, thank you very much.(Photo: Kevork Djansezian/Getty Images)

Photo By Kevork Djansezian/Getty Images