Rihanna celebrates turning 25 with on-off boyfriend Chris Brown in Honolulu.
Rihanna Instagrams a pic of herself sitting on Chris's lap in the back of their chauffered ride.
The duo appear inseparable (or at least an intertwined) at her fête.
Chris's lap sure must be comfy.
Rihanna also enjoys a sweet treat.
Rihanna's brother, Rorrey Fenty, also joins in the festivities.
But her bright, bold cake steals the show.
MORE: Another Romantic Beach Getaway