Kloe split from the former US basketball player in December, 2013 and subsequently filed for divorce.
However, she put the legal filing on hold after he was found unconscious in a brothel near Las Vegas in October last year, and spent months in hospital as he recovered from a drug overdose and a series of strokes, reported Entertainment Weekly.
He was released from hospital in January, and Lamar made his first public appearance alongside Khloe and the rest of the Kardashian/Jenner clan to support brother-in-law Kanye West at his New York Fashion Week runway show and album listening party on February 11.
However, Khloe insisted their current relationship was strictly platonic, even though she vowed to continue supporting her estranged husband in his time of need.
On Sunday, Lamar joined Khloe and the rest of her family for church services in California to celebrate the Easter holiday.
The former couple was also seen leaving Ruth's Chris Steakhouse in Woodland Hills, California on Friday.