She's not shy of gushing about her loved ones online.

And Bindi Irwin chose to dedicate a sweet post to best friend of 10 years Jesse Wilkinson on Thursday for her birthday.

The wildlife conservationist, 18, shared a picture of the pair in sundresses to reminisce on their friendship, before saying: 'Have a beautiful day lovely.'

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'Can't even imagine life without you': Bindi Irwin posts touching birthday message to her BFF via Instagram on Thursday

The pair are believed to have met while of primary school age, forming a friendship that has lasted almost a decade.

'We became friends almost 10 years ago and now I can't even imagine life without you,' Bindi gushed about her brunette friend.

She also ended her post with a hint of sad news: 'I wish I could be there to help you celebrate but I love you and I'm with you in spirit.'

'I wish I could be there to help you celebrate': While the wildlife warrior gushed over their long-standing friendship she admitted she couldn't help her celebrate this year, but missed her

'My sunshine': Her friend was quick to thank Bindi for her kind words, saying that she missed her and loves her 'always and forever'

Her friend was quick to respond: 'Thank you so much my sunshine Love you always and forever xx @bindisueirwin Miss you.'

Bindi has previously doted over her gal pal in adoring snaps together.

Last year she left Jesse with an extended message, thanking her for 'helping me solve all the world's problems, as well as listening to my endless stories.'

'All adventures with you are always so much fun': Last year she shared another touching tribute to her friend with boyfriend Chandler Powell visible in the background

Posing against an abandoned hut in the outback, she insisted: 'Exploring and hiking and all adventures with you are always so much fun.'

It's unsure where her best friend resides, but the fact she can't visit may be linked to her American beau Chandler Powell arriving back in Australian in recent weeks.

They pair been together for two years, but three weeks apart proved a long lonely wait over Christmas before being reunited.

Young love: Bindi and Chandler have been together for two years, but three weeks apart proved a long lonely wait over Christmas before being reunited

The American wakeboarder has hinted he is likely to stay at Australia Zoo with Bindi for the duration of the school holidays.

The loved-up couple enjoyed a romantic picnic dinner last week, to which Bindi captioned a candid video: 'You make me so happy.'

She filmed Chandler trying his first ever lychee, to his delight.

Bindi wore a flannel T-shirt jacket, black singlet and denim shorts, while Chandler lay down on the grass in a black graphic print T-shirt.