People re-gift all the time, right?  Sweaters, appliences and things in general they don't want or need.  What about re-gifting flowers?

A femaile co-worker of mine, who will remain nameless, recieved flowers from a friend today.  Just a friend, nothing more, so she's not exactly attached to the flowers.  She has a graduation to go to this weekend and is contemplating re-gifting the flowers.

Is it ok or tacky?