The pair appear together as guest judges on RuPaul's Drag Race

Credit: Mathu Andersen

Through a decade of blissful partnership and fraternal twins, there’s got to be some kind of formula that makes things just click for Neil Patrick Harris and David Burtka.

The lovey-dovey duo appeared on an upcoming episode of RuPaul’s Drag Race, where they were put on the spot about the success of their love.

“What’s the secret to your relationship?” Ru asked.

With only a quick moment of hesitation, Burtka, 38, responded, “Oh, wow, umm, never go to bed angry.”

But it was Harris, 40, who came out with the kicker, telling the host, “Yeah, I haven’t slept for six months.”

All kidding aside, the pair have openly expressed their heartfelt love for one another.

“Without him, I can’t breathe,” Burkta has said. “The biggest thing is that he makes me laugh, but he’s also smart. He can do everything. I’m not kidding; I think he’s half robot. He makes me a little more grounded, and I bring out the wild side in him.”