Rihanna has fallen ''in love'' with her cousin's baby.

The 'What Now' hitmaker has declared her love for her cousin Noella Alstrom's newborn daughter by posting a number of adorable snaps of herself and the baby on Twitter.

In one picture, where Rihanna is seen cradling the tiny tot as she enjoys a nap, she wrote the caption: ''Guess who fell asleep at the hospital again? #AuntyOhNaNa (sic).''

In another heartwarming picture, which was accompanied by the caption ''In Love...'' the newborn baby is seen lying on her ''aunty'' Rihanna's chest.

The 26-year-old star also demonstrated her love for sports in a series of pictures on her Twitter account, including in one where she and the baby are wearing matching Miami Heat basketball vests while lounging on the floor.

Another picture of the inseparable pair featured the caption, ''Aunty change this World Cup back to cartoons NOW'', while Rihanna later claimed she would be supporting Ghana in the soccer match between the African side and the United States, because of her crush on a certain player.

Alongside a picture of Ghana soccer star Kevin Prince Boateng, she wrote: ''Da Bae doe! I might have to be Ghana on this one idc idc idc (sic).''