The woman, who accompanied Larry to his son's baseball game yesterday, is Wendy Walker (above) -- the longtime senior executive producer of "Larry King Live."
Sources tell us the phones have been ringing off the hook with inquiries about Larry's "mysterious" new lady friend -- but we can confirm that they're just friends.
She, Larry, and a few more of Larry's buddies also had lunch together with the boys earlier in the day. Based on the photo, she'd give her left arm for her boss.