Kristen Stewart , Rob Pattinson Strip Down to Bikini, Swimtrunks

Credit: AKM Images (2)

Rob Pattinson and Kristen Stewart are taking it off!

The real-life couple continued filming their honeymoon scenes for Breaking Dawn in Brazil earlier this week.

In one sexy scene, Bella (Stewart, 20) and Edward (Pattinson, 24) have slipped out of their street clothes to frolic in a waterfall.

Stewart donned a sexy white bikini, while her offscreen paramour Pattinson wore a pair of red swim trunks hanging dangerously low on his waist. See more steamy pics at Popsugar.

How are the pair doing when the cameras aren't rolling? "They are much more open about being a couple," a source close to Pattinson recently told Us Weekly. "You can't not love them. They are the cutest."

Another pal even adds: "I wouldn't be suprised if they got married in the next year."

In the meantime, the duo will be filming parts one and two of Breaking Dawn over the next eight months, primarily in Baton Rouge, Louisiana.