(AP Photo/Jacquelyn Martin)

President Obama told Jay Leno tonight that his former secretary of state, foe-turned-friend Hillary Clinton, "had the post-administration glow" when they met for lunch last week.

"You know, when folks leave the White House, about two weeks later they look great," the president jokingly told Leno on his sixth appearance on NBC's "The Tonight Show," his fourth since taking office.

The president said he and his 2008 rival, who is widely speculated to be readying a 2016 run for the White House, are "genuinely close."

"I could not have more respect for her," he said.

Obama invited Clinton, whom he praised as a "great secretary of state," to lunch at the White House last Monday to catch up.

"We had a great time," he said.

"Did you notice her measuring the drapes or anything like that?" Leno asked.

"Keep in mind she's been there before… She doesn't have to measure them," Obama quipped in response.