Lamar Odom's ex-girlfriend insists they are not reuniting.

Liza Morales, who has two children, Destiny, 15, and Lamar Jr., 11, with the basketball star, hit back at rumours she is comforting him following his split from his wife of four-years, Khloé Kardashian.

She wrote on Twitter on Wednesday (18.12.13): ''The new rumours are so ridiculously false, they are actually somewhat comedic. Being cordial is always beneficial when children are involved.''

The former couple's daughter Destiny also recently said a reconciliation would ''never happen.''

A source previously claimed that Lamar, 34, would be spending Christmas with Liza and their children, and that she has been supporting him since Khloé filed for divorce last Friday (13.12.13).

The insider said: ''Lamar has been talking to Liza in the last few weeks, and she has been a tremendous source of strength for him. Khloé was always insanely jealous of Liza and that is why Lamar distanced himself. He now recognises that was a mistake.''

The former couple, who were previously said to have been embroiled in a bitter custody battle in May, also had a son, Jayden, who died in 2006 when he was six-months old from Sudden Infant Death Syndrome.

Liza posted a photograph of the little boy on Instagram on what would have been his eight birthday on Sunday (15.12.13), with the caption: ''Your due date was December 25th. Our gift came early that year, December 15th. But you also left us early, too early. Our hearts will ache for you till we our reunited. We love you and miss you baby boy. Happy 8th Birthday Jayden #Heaven #Birthday #Love''

Liza's comments came just hours after 'Keeping Up with Kardashians' star, Khloé, said she was heart-broken over the collapse of her marriage.