Haha. Joaquin Phoenix is perhaps the only actor in Hollywood to lie about being engaged on the David Letterman show, but yep, he did it. The Her actor told the veteran host on Monday's show so that he was set to marry a yoga instructor, getting cheers and applause from the live studio audience.

Inherent ViceJoaquin Phoenix stars as Larry Sportello in Paul Thomas Anderson's Inherent Vice

Phoenix appeared on Good Morning America, where he revealed that he made the whole thing up. GMA tweeted on Tuesday that the actor is not engaged and wanted to "space up his story a little bit."

"I think my life's so boring, and it seemed like something exciting to talk about, and I wanted the audience to like me," he said on Good Morning America. "They really like people getting married.I can get engaged again, if you like."

More: Joaquin Phoenix is joined by first-rate cast in Paul Thomas Anderson's Inherent Vice

The actor's publicist also denied the engagement, telling the Independent, "Joaquin has an extraordinary and spontaneous sense of humor but it is not true."

Joaquin PhoenixReese Witherspoon [L] co-stars alongside Joaquin Phoenix [R] in Inherent Vice

During the Letterman show, Phoenix gave a fictional account of how he fell in love with the instructor, saying, "First we do these breathing exercises and I go, 'I can do this'...and then she says we are going to get in the first position - the harnessing of the hog.Before I can say, 'Who is the hog,' she grabs me...[and] it's a compromising and vulnerable position, and she gets a strap and puts it [around me]...and she's thrusting. And I go, 'Oh, no! My back pain!' And she goes, 'No, that's your emotional back pain.'"

"I think she's the one," he told Letterman. "I proposed to her and she said yes. If everything works out...so far, so good."

More: check out our Joaquin Phoenix pictures

Phoenix next stars in Paul Thomas Anderson's adaptation of Thomas Pynchon's Inherent Vice, about the drug-fuelled Los Angeles detective Larry Sportello who investigates the disappearance of a former girlfriend. 

Watch Joaquin Phoenix in the trailer for Inherent Vice: