The ‘Twilight’ star and the singer went for some lunch before hitting the shops for a few hours of retail therapy, the Daily Mail reported.
The couple then headed off to celebrate Joe’s brother Brankie’s 10th birthday.
Greene, who shot to fame by playing vampire Alice in hit ‘Twilight’ franchise was first seen enjoying a romantic dinner with Joe at The Ivy in London in July.
Greene, 23, was in town to attend the premiere of Twilight, in which she starred as Alice Cullen, and Joe was there to support his brother Nick in his stage debut, appearing in Les Miserables.
Earlier, Joe was dating teen sensation Demi Lovato whom he split from in May.
Meanwhile, it seems things are starting to get serious between the Ashley and Joe.
Greene is said to have introduced Joe to her parents in Jacksonville, Florida.