The 35-year-old pro basketball player was lastly seen in October last year when he steeped out from a gym in Los Angeles
The former NBA star was seen in Studio City hiking at Fryman Canyon Park on Wednesday, February 25.
Lamar rocked a sporting outfit, wearing a red and grey jacket with matching shorts and long dark socks while enjoying the comfort of his black and white Air Jordan kicks.
The 35-year-old hasn't been seen in public since October last year but posted a photo on his Instagram earlier in February sitting on a doorstep with a group of buddies looking quite happy.
In the new issue of OK! Magazine it is claimed that the estranged couple, who were torn apart by alleged drug use and infidelity (on his part), have been secretly hooking up at a quiet hotel near her mansion in Calabasas for months.
The insider added: "They are talking and texting. Khloe doesn't know what to do. She can't say no to either of them.”
Meanwhile, Khloe is also alleged to be juggling a romance with her on-off beau, rapper French Montana.