Rob's Rakish Grin

From OK! Magazine:
He may not think of himself as a ladies' man, but Twilight has catapulted this Brit newcomer to the top of Hollywood's most wanted list!

Isabelle Adams, author of Robert Pattinson: Eternally Yours, writes, "It's like he's got the sex appeal of two guys in one! Look at the eyes, the cheekbones, the rakish grin...He's got smoldering down pat! AND everything girls have been imagining for Edward too!"

rak⋅ish

2   /ˈreɪkɪʃ/ Show Spelled Pronunciation [rey-kish] Show IPA

–adjective

1.	smart; jaunty; dashing: a hat worn at a rakish angle.

2.	(of a vessel) having an appearance suggesting speed.

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Origin:
1815–25; rake ³ + -ish ¹

Synonyms:
1. sporting, dapper, debonair, breezy.

Rakish grin? That's a new one to me... but it fits! ;)