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Russell Brand is opening up more than ever about his divorce from Katy Perry -- and confirming his new relationship with another celebrity's sister.

"[Before] we got married, I just thought, ‘I’ve got to marry her, I just love her so much.’" Brand told Howard Stern this morning of his relationship with Katy. "And then we got married and I thought, ‘Okay, this isn’t really working out.’”

But, as he's said before, there's absolutely no ill will there between the former lovebirds.

"It was a lovely relationship ... it mostly didn't work for practical reasons ... We did work it out, she's happy, I'm happy," he added (via MTV).

And helping making him happy these days: New girlfriend Isabella Bewster.

Isabella is the sister of "Dallas" and "Fast and the Furious" star Jordana Brewster and the two have been spotted all over L.A. together recently.

"Some things in the newspaper aren't true ... that's true, actually," he said of reports he and Isabella are together -- adding that he's "just kind of enjoying the freedom" of being single.

He also added someone -- probably Isabella -- was with him in bed during the radio interview.

As for why he walked away from the marriage without trying to claim half of the $44 million Perry earned while they were together, he says "I've got a good job. I'm not into taking money from women."

Check out a snippet of the interview below: