This article originally appeared on Entertainment Weekly. For more stories like this, visit ew.com.

By EW.com/Derek Lawrence
Updated Feb 22, 2017 @ 8:30 am
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Maisie Williams Sophie Turner - Lead 2017
Credit: Matt Winkelmeyer/BAFTA LA/Getty

Proving they have slightly a better relationship than their Game of Thrones characters, Maisie Williams wished a happy 21st birthday to her costar and close friend Sophie Turner with an adorable throwback pic.

The 19-year-old actress, who plays Arya Stark on the hit HBO series, sent birthday wishes to her TV sister on Twitter with a sweet image of a pre-teen Williams admiring the much taller Turner. Williams wrote, “Happy 21st Birthday @SophieT. Forever looking up to you, in more ways than one.”

This is just the latest lovely moment between the charming duo. Last year, they got matching tattoos and this past Halloween, they dressed up in weed brownie costumes.

VIDEO: See the Game of Thrones Cast Out of Their Costumes

Ahead of GOT returning this summer for its penultimate season, Williams and Turner will participate in a panel for the series at next month’s South By Southwest festival.

This Story Originally Appeared On Entertainment Weekly