Source: Robert Pattinson and Kristen Stewart are Dating

Earlier this week, Robert Pattinson turned 23.

According to Us Weekly, the rising star didn't celebrate alone: he, his parents and a trio of New Moon co-stars arrived at Vancouver's Global Grill and Satay Bar on Wednesday night.

While Ashley Greene and Jamie Bower were present for the birthday celebration - which involved high-class delicacies such as Kobe beef meatballs, lamb and steak satays - Twilight fans might be more interested in Pattinson's activities with the other actress in attendance:

Kristen Stewart.

Are Robert Pattinson and Kristen Stewart dating? The rumor mill is in full swing!

After dinner, sources say Pattinson and Stewart ditched the group and headed to an adjoining lounge together, where he drank beer, she sipped champagne and the rumors really started to flow.

"Robert and Kristin are a very, very smart couple," an insider says. "They're friendly and playful but never affectionate in public. Never. Never any hugs or kisses. It's just not their style."

So, are these two really a couple? If so, what nickname should they go by? Pewart? Stattinson? Edward and Bella?

Write in with your best suggestions!