Ashley Greene and Joe Jonas
JCalderon/Splash News Online
03/17/2011 at 02:00 PM EDT
It's twilight for Ashley Greene
and Joe Jonas
The couple, who had been dating since last summer
, have broken up, their reps confirm to PEOPLE.
Greene, 24, who plays Alice Cullen in the Twilight
films, and Jonas, 21, one-third of the Jonas Brothers, went public with their relationship last fall after dating quietly for a few months.
A source told PEOPLE at the time that Jonas was "head over heels" for Greene. They remained an item through the winter
, most recently celebrating Greene's 24th birthday
last month in Las Vegas.
In recent weeks, the two, who were never shy about affectionate public appearances
, were spotted – separately – at various L.A. clubs. On March 11, Greene and Zac Efron partied with pals
at Trousdale Lounge, while Jonas spent a guys' night out
at the same club three nights earlier.
Greene is currently filming the latest Twilight
film, Breaking Dawn
, in Vancouver. Jonas, who previously dated Demi Lovato
and Taylor Swift
, will release his first solo album this summer.
Reporting by JULIE JORDAN