The `Ghost Whisperer` star and actor-director Alex have decided to call time on their relationship after less than a year together.
Jennifer`s rep told website usmagazine.com: "They haven`t been dating for a little while."
A friend of the actress also confirmed the news, adding that she is "doing well" in the wake of the split.
The couple got together in July last year, and while the exact date they parted and reasons behind it are not yet known, things were still romantic between them in February.
At that time Jennifer, 32, said: "He buys me flowers every day. Ever since we met. Every single day - I`m serious! He`ll either give me a bouquet, or handpick one. So sweet!"
Before meeting Alex, Jennifer - who has written a dating book called `The Day I Shot Cupid` - was in a relationship with actor Jamie Kennedy, and she has also previously been linked to singer John Mayer, TV host Carson Daly and actor Ross McCall.