Lamar Odom "Upbeat," Acting His "Normal Self" and Looking Healthy After Leaving Rehab

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Lamar Odom is at least acting none the worse for wear as he deals with some pressing issues.

After leaving rehab following a very brief stay, Khloé Kardashian Odom's husband was spotted today having miso soup and hot tea with another guy at Japanese restaurant Octopus in Los Angeles. Clad in a T-shirt and shorts and wearing sunglasses and his wedding ring, he seemed in good spirits.

According to a witness, Odom was "smiling" and "very nice and polite," at one point holding the door open for another guest on his way out of the Roosevelt Lofts, which is next to Octopus.

Another restaurant-goer snapped a cell phone pic of Odom and he left a short time later, probably wanting to beat the inevitable Twitter alert.

Additionally, he "seemed upbeat" last night, another source exclusively tells us.

"He was in a good mood and did not seem down at all," the source says. It would have been expected if Lamar had been feeling low, the insider adds, but "that was not the case."

"In fact," the source says, "he even signed a fan's autograph. He was his normal self, nice and polite."

That does sound like Odom.

Following an incident with a paparazzo near his home in July in which he grabbed a camera bag and tossed it in the street, Khloé later tweeted that her hubby had made time to take pictures with fans who had gathered around.

Those who have worked closely with Odom also have had nothing but positive things to say about the 33-year-old athlete's character.

"He had a big heart, and really wanted to help people. Just seeing how he loved to help people," former Lakers teammate Josh Powell told E! News this week. "He was just a great energy to be around. When you come across people like that, you kind of take that with you as you mature and grow."

Laker Jordan Farmar posted a Throwback Thursday pic of him and Odom yesterday captioned, "My big homie LO! One of the most incredible human beings you'll ever meet! Nobody is immune to tough times. I love you dog and am always here if you need me! #tbt #family."

Odom was arrested early last Friday morning during a traffic stop and booked on charges of driving under the influence and refusing to take a chemical sobriety test. A court hearing is scheduled for Sept. 27.