Robert Pattinson attends the premiere of "Cosmopolis" on May 31, 2012 in Berlin, Germany. Credit: Target Presse Agentur Gmbh/Getty

Ready or not, R-Patz is coming out of hiding next week.

In seclusion since learning of love Kristen Stewart's fling with Rupert Sanders, Robert Pattinson will kickstart promotions for his new film, Cosmopolis -- including a live TV interview on Good Morning America next Wednesday, August 15, a rep for the film confirms to Us Weekly.

The British star is also expected to hit the red carpet in NYC two nights earlier.

Pattinson has been enjoying some R&R at the $7 million, 7-acre ranch in Ojai, Calif. lent to him by pal Reese Witherspoon. Over the weekend, he was spotted having "a few drinks and laughs" at a local country-western bar, Deer Lodge.

"Rob's a total mess, trying to figure out why Kristen did this," a source told Us Weekly.

Back in late May -- about a month and a half before she and Sanders, 41, were photographed making out in L.A. -- Stewart had nothing but praise for Pattinson's performance in Cosmopolis. "He's so good in it!" she told MTV News of the edgy, harrowing film, directed by David Cronenberg and based on Don Delillo's novel. "He's really, really [good]. I don't even know how he [did it]. I couldn't even understand it. It's so good, it's so cool and I'm so proud of him."