In case you're doing your homework on first-time Oscars host Seth Mac Farlane before Sunday's big awards show, we've created a handy crib sheet.
And it seems that Joe knows exactly how to treat a girl to a perfect day out.
The two first went for some lunch before hitting the shops for a few hours of retail therapy.
Rumours started about the couple dating after they were spotted together enjoying a romantic dinner at The Ivy in London back in July. Despite the perfect daytime combination of lunch and then shopping Greene looked decidedly glum Ashley, 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.
Jonas had been dating teen sensation Demi Lovato whom he split from in May.
The 26-year-old Twilight actress and the Australian TV personality were photographed holding hands while going out for lunch together at Vivian's Cafe in Studio City, Calif on Sunday, Sept. Greene, wearing a light T-shirt, jeans and black boots, had a smile on her face while walking with Khoury, who dressed casually in a black tank top and grey sweatpants.