Billie Lourd's stepfather has paid tribute to Carrie Fisher and Debbie Reynolds

He posted a picture of Billie, Debbie and Carrie, from Billie's New York University graduation, and wrote: "@praisethelourd it's an honor to be your Stepfather. This day, your NYU grad day we had so much fun! Yankee Stadium your mom and I laughed our asses off, as she kept one fantastic line coming after the other - no less when we all fell asleep the night before in the smaller ceremony because it was so boring. Every time Carrie looked at me she said " how are you still awake"! Your grandmother with our sweet Ava was the kindest most loving. So...as Carrie said to me years ago " I'm a good stepmother" I promise I will always be & the strength of these women live so vibrantly in you. I've been lucky enough to see this for a decade! Many decades to come.....heaven just got a s**t load more fun!!!! I love you @praisethelourd xo Bru Thursday 12/29/16 (sic)."

Meanwhile, Carrie, 60, and Debbie, 84, could be set for a joint funeral but the family is still in discussions about the memorial.

Debbie's son Todd Fisher said: "That is my preference. Obviously it's not finalised, but I think that sounds like a grand idea given the beautiful story between them."

And Todd previously stated that he believes Carrie's death led to Debbie's own sudden demise.

He said: "She went to be with Carrie. In fact, those were the last words that she spoke this morning.

"More specifically, she said that she really, she was under a lot of stress.

"She held it together beautifully, obviously, for the last couple of days but she was under a lot of emotion and stress from the loss [of Carrie] and it's pretty much what triggered this event."

Debbie was at her son's Beverly Hills home to discuss funeral plans for the 'Star Wars' actress' when she suffered a medical emergency, believed to be a stroke, and the paramedics were called.