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/ Source: TODAY
By Randee Dawn

As fans, we may mourn the loss of Carrie Fisher and Debbie Reynolds, but we can only imagine what Billie Lourd, who lost both mom and grandma within days of each other, is going through.

But on Monday, she gave us a brief glimpse into what life has been like since both died last week, and thanked fans for their support and strength in a touching Instagram post that featured the trio in happier days:

She also shared that shot with two other throwbacks on Twitter with another sentiment:

RELATED: The story behind that photo of Carrie Fisher watching mom Debbie Reynolds on stage

Reynolds, 84, died of an apparent stroke on Dec. 28, just one day after Fisher, 60, succumbed from a heart attack. Lourd, 24, who stars on the Fox show "Scream Queens," uses her father Bryan's last name.

It's the first throwback photo the actress has posted of her mom since her death, but Lourd has posted other pictures of herself with "Momby" in the past:

RELATED: 'Devastating': Debbie Reynolds' death leaves stars reeling after loss of Carrie Fisher

Her uncle (Carrie's brother and Debbie's son) Todd Fisher also shared a heartwarming tribute on Dec. 29:

Clearly, close ties run in the family. All our sympathies.

Billie Lourd with Debbie Reynolds and Carrie Fisher at the 2015 Screen Actors Guild Awards in Los Angeles.Kevin Mazur / WireImage

Follow Randee Dawn on Twitter.