Billie Lourd on the devastating loss of her mother Carrie Fisher and grandmother Debbie Reynolds

Scream Queens star Billie Lourd has broken her silence following the deaths of her mother Carrie Fisher and grandmother Debbie Reynolds. In a touching post on Instagram, the young star shared a sweet throwback photo of the three generations of actresses along with a note to those who have sent her messages of condolence.

TAP TO VIEW GALLERYBillie's grandmother Debbie Reynolds and mom Carrie Fisher both tragically died last week

"Receiving all of your prayers and kind words over the past week has given me strength during a time I thought strength could not exist," she wrote. "There are no words to express how much I will miss my Abadaba and my one and only Momby. Your love and support means the world to me."

The 24-year-old has endured unfathomable tragedy in the past week. Her mother, Star Wars actress Carrie, died at age 60 on December 27, four days after suffering cardiac arrest on a flight from London to Los Angeles.On December 28, Carrie’s 84-year-old mother Debbie Reynolds, star of Singing in the Rain, suffered a stroke while helping organize funeral plans and died a short time later.

Debbie’s son Todd Fisher confirmed his mother’s death last Wednesday. "She's now with Carrie and we're all heartbroken," he told the Associated Press, noting that the stress of his sister's death "was too much" for his mom.

DEBBIE REYNOLDS LIFE IN PICTURES

Todd opened up about how the family was handling the devastating double loss. He said: "We're broken-hearted, those of us that are left behind. We also are happy that they're together. It's horrible, it's beautiful, it's magical they are together, it's beyond words, it's beyond understanding. From the family's perspective, this is Debbie's destiny. She didn't want to leave Carrie and did not want to her to be alone."

The two stars will be buried together during a joint service, with time and date yet to be announced.

HELLO! Canada magazine is available for your tablet and smartphone. Get HELLO! Canada, PEOPLE, Vanity Fair and over 100 more of the world’s best magazines for one low monthly price at Texture by Next Issue. CLICK HERE to sign up for a free trial.