Photo: Heather Locklear/Instagram

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Heather Locklear‘s daughter is all grown up!

The 57-year-oldMelrose Placestar shared a loving video tribute to Instagram on Thursday in honor of her only child Ava Sambora’s 21st birthday.

Captioning the post “Happy Birthday Sweet Child of Mine,” Locklear, who is currently seeking long-term treatment in rehab, showcased a series of framed photos of Ava throughout the years.

“I want to say happy birthday to my favorite person in the world. Ava, my princessa, my one and only,” continued Locklear, who lit multiple candles for Ava.

The actress praised her daughter, who she shares with ex Richie Sambora, as “the kindest, funniest, smartest, most beautiful child in the world and you’ve turned out to be so wonderful — well, you came to me that way. I love you, I want to squeeze you and kiss you and spank you 21 times.”

Last month, Locklear celebrated her 57th birthday at the facility she checked into in July to receivelong-term treatmentfor substance abuse and mental health.

“She’s still there and she’s doing really well,” a source said.

To celebrate her mother’s birthday, Ava posted a sweet message on Instagram Sept. 25.

“Happy birthday to my gorgeous mama 💘🎂⚡️” Ava captioned a smiling photo of the pair.

A source previously told PEOPLE that the actress was scheduled to remain at the facility until September and doctors would reevaluate from there.

RELATED VIDEO: Heather Locklear Treated for Possible Overdose Hours After Arrest for Attacking an Officer

Locklear was arrested in June for allegedly attacking a police officer and an EMT who had responded to a disturbance call at her residence. Police told PEOPLE that Locklear was allegedly “extremely intoxicated” and “arguing with friends and family” when they arrived.

Hours after she wasreleased from police custody, Locklear was hospitalized for apossible overdose.

In mid-September, shepenned a heartfelt tributeafter losing a friend to addiction.

“Addiction is ferocious and will try to take you down,” reads the note. “Recovery is the best revenge. Be kind to everyone you meet, your light just might change their path. Rest in peace beautiful Josh. You touched my [heart].”

source: people.com