She admitted she was 'terrified' of taking mom Christie's place on Dancing With The Stars on Monday night.

But Sailor Brinkley-Cook looked like she didn't have a care in the world on Tuesday, when the 21-year-old bikini model took a spin around LA in a Mustang with her brother Jack and boyfriend Ben Sosne.

Christie was all smiles as the group made a pit stop to grab some coffees in West Hollywood.  

Her man: Sailor Brinkley-Cook [R] looked like she didn't have a care in the world on Tuesday, when the 21-year-old bikini model took a spin around LA in a Mustang with her brother Jack and boyfriend Ben Sosne [L]

The daughter of Christie Brinkley and architect Peter Cook showed off her model form in a flower print sun dress, which she wore with white sliders on her feet. 

The blonde beauty wore her golden tresses loose and cascading across her bare shoulders.

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Over her right shoulder was a black handbag, while she carried an iced beverage from Alfred's Coffee in her left hand.

Her beau made the most of the final days of summer in a tank top.

The last days of summer: The daughter of Christie Brinkley and architect Peter Cook showed off her model form in a flower print sun dress, which she wore with white sliders on her feet

Cruisin': Sailor's half-brother Jack [far right] -who is good friends with Sosne- wore a long sleeved T-shirt with green cargo pants as he and his sister and their pals climbed into the vintage convertible

Sailor's half-brother Jack -who is good friends with Sosne- wore a long sleeved T-shirt with green cargo pants as he and his sister and their pals climbed into the vintage convertible.  

Sailor stepped in to compete on Dancing With The Stars when her mother Christie Brinkley tripped and broke her arm last week.

And on Monday evening the blonde bombshell made a dazzling debut on the dance competition show.

But the blonde beauty told People that at first she really didn't want to do the Samba in front of a live audience. 

Into the breach: Sailor stepped in to compete on Dancing With The Stars when her mother Christie Brinkley [L] tripped and broke her arm last week

Terror: 'I didn't want to at first, honestly,' Sailor admitted. 'I was terrified. It was a very scary thing for me'

'I didn't want to at first, honestly,' Sailor admitted. 'I was terrified. It was a very scary thing for me. The whole idea of having to be live on stage, be on TV dancing, that's something I've never done before.

'I was so scared, but that was the reason I had to do it,' she continues. 'I had to surpass the fear. I had to be stronger than the things that scare me.'

Her mother, who used to be married to Billy Joel and starred in his Uptown Girl music video, told her to enjoy it.

Model looks: Her mother, who used to be married to Billy Joel and starred in his Uptown Girl music video, told her to enjoy it

'[My mom] told me to have fun with it and to not let fear stop me from doing any of it,' Sailor adds.

'I'm doing this mostly for my mom!' Sailor said during the premiere. 'I just want to make her happy and make her proud.'

'She loved doing this, she loves dancing and she loves performing and getting hurt was her worst nightmare,' she added.

Doing it for Christie: 'I'm doing this mostly for my mom!' Sailor said during the premiere. 'I just want to make her happy and make her proud'

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