Anna Nicole Smith's lookalike daughter Dannielynn turns 18 – see how much she's changed

It's a big day for Dannielynn Birkhead and her dad Larry as the duo celebrate her milestone 18th birthday.

The teenager has been raised largely out of the spotlight following the death of her mother, Anna Nicole Smith in 2007 when Dannielynn was just seven months old.

Anna Nicole was found unresponsive in a Florida hotel room and was pronounced dead in hospital. She was just 39.

Initially, it was Anna Nicole's husband, Howard J. Marshall – who was 63 years her senior – who was listed on the birth certificate as Dannielynn's father. However, Larry claimed paternity, and a DNA test later confirmed that he was indeed the little girl's dad.

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Over the years, Larry has shared snippets into Dannielynn's life and the father and daughter duo have a joint Instagram account, which they update with sweet photos of their various outings.

As Dannielynn has grown older, the resemblance to her late mother is uncanny and she has inherited her full lips, beaming smile, and blonde hair.

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Dannielynn is incredibly close to her dad, but he has made sure to keep her mother's memory alive and each year they attend the Barnstable-Brown Gala ahead of the Kentucky Derby, which is where Larry met Anna Nicole in 2003.

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Larry started the tradition when Dannielynn was just three years old, previously revealing that he takes his daughter to the annual event to both honor the past as well as to create new memories with her.

Talking to Fox News Digital, he explained: "It's kind of been a tradition that we would go every year.

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"Since I did meet her mom there, it started off just kind of me taking her back and showing her around and kind of letting her know the stories that, you know, this is kind of where I met your mom and things."

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Larry added: "And then it came to kind of people look for my daughter there because I really don't let her do any public events. And so, in all honesty, the Kentucky Derby is kind of the growth chart for Dannielynn."

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Larry kicked off Dannielynn's birthday celebrations last month with a trip to California to attend the Official Power Morphicon Convention, a biannual Tokusatsu convention, the franchise behind Power Rangers.

For the special event, Dannielynn dressed up in different costumes and wigs to meet some of her favorite Tokusatsu actors.

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Sharing photos of the weekend on Instagram, Larry penned: "Had an awesome time at this weekend's @officialpowermorphicon in Pasadena, California thanks to @tokuspirits! Dannielynn got to meet some of her favorite actors from Japanese live-action television."

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He added: "She was so excited to meet @maaaaaaaasahiro (Masahiro Inoue) who plays 'Decade' from 'Kamen Rider Decade' that she was overcome with joy. She was also excited to meet @yuikoike_official (Gokai Pink) and @ozawa_ryota (Gokai Red) from 'Kaizoku Sentai Gokaiger' @yasuhisa_furuhara0813 (Go-on Red) from 'Engine Sentai Go-Onger' was her other favorites!"

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Sharing details about her costumes, he explained: "Dannielynn cosplayed three different 'Kamen Rider' characters at the event. First up was, 'Hino Eiji' Followed by 'Ankh' (@ryosuke.miura216 ) and to finish the convention off, she cosplayed Ankh possessing Eiji from the 'Kamen Rider OOO 10th: Core Medal of Resurrection' movie, complete with Ankh's (Greeed) bird-style hand and feather infused hair."

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Teasing that there was much more to come for Dannielynn's special day, Larry added: "This is the first stop and pre-celebration for Dannielynn's upcoming birthday celebration! The countdown begins now!"