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Rihanna sings Happy Birthday to Eleanor Calder, girlfriend of One Direction's Louis Tomlinson

Eleanor Calder is the luckiest girl in the world - not only is she dating One Direction hottie Louis Tomlinson, she also got her very own Happy Birthday message from Rihanna!

RiRi posted a clip on Viddy of herself giving Eleanor the very best in birthday wishes.

Just so everyone was sure which Eleanor she was singing to, Rihanna sang, "Happy birthday to Eleanor the girlfriend of Louis from One Direction" and blew a kiss at the end of the 15-second video.

Eleanor's doting boyfriend also wished her a happy 20th birthday on Twitter, writing, "A very happy birthday to my lovely girlfriend @eleanorjcalder. Love you lots and lots #happybirthdayeleanor"