The Week in Celeb Twitpics (PHOTOS)
Summer is in full swing and celebrities are slipping into bikinis for a day out at the beach.
Who else headed for the open waters -- and tweeted about it?
Launch the gallery to see this week's best celebrity Twitpics.
Rihanna, 24, definitely got a little bit Twitter-happy during her vacation.
See below for the full collection of her vacay photos.