Billie Lourd Shares Touching Tribute to Mother Carrie Fisher and Grandmother Debbie Reynolds

Billie Lourd, Carrie Fisher and Debbie Reynolds - 21st Annual SAG Awards -Getty -H 2016
Kevin Mazur/WireImage/Getty Images

"There are no words to express how much I will miss my Abadaba and my one and only Momby," the 'Scream Queens' actress wrote Monday in an Instagram post.

Billie Lourd has broken her silence on the deaths of mother Carrie Fisher and grandmother Debbie Reynolds.

In an Instagram tribute posted Monday, the Scream Queens actress shared an old family photo and thanked friends and fans for giving her "strength" during a difficult time.

"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," Lourd 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."

Fisher died at age 60 on Dec. 27 after suffering a heart attack days prior. Just one day later, Reynolds was rushed to the hospital after suffering a stroke and passed away that night. She was 84.

Star Wars creator George Lucas, Harrison Ford and Scream Queens co-star Ariana Grande were among those who sent their condolences to Lourd shortly following the news of Fisher's death.

On ABC's 20/20, Reynolds' son Todd Fisher revealed he and Lourd are planning a joint funeral for the mother and daughter pair, which will be held privately at the Forest Lawn Memorial Park in Los Angeles. The two will be buried next to each other.

Lourd is the daughter of Fisher and talent agent Bryan Lourd.