Ashlee Simpson stuns in a floral patterned dress alongside husband Evan Ross at ...

Ashlee Simpson wowed in a beautiful floral dress on Friday at an event promoting the cactus water brand Caliwater. 

The singer attended the event alongside her husband, actor Evan Ross, at the Mojave Moon Ranch, just outside Joshua Tree National Park in Southern California.

The 36-year-old singer showed off her effortless style, pairing a white gown with floral detailing with Dr Marten boots - ideal for the desert landscape.

Desert style: Singer Ashlee Simpson and her husband, actor Evan Ross, looked picture perfect as they appeared at the Caliwater launch event at the Mojave Moon Ranch in South California on Friday

Desert style: Singer Ashlee Simpson and her husband, actor Evan Ross, looked picture perfect as they appeared at the Caliwater launch event at the Mojave Moon Ranch in South California on Friday

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The Pieces Of Me singer, who gave birth to her third child Ziggy in October, paired the flowing maxi dress with a pair of chunky hoop earrings. 

For her makeup, she opted for a plum-coloured lipstick and a smokey eye with a dewy skin look. 

Ashlee's beautiful blonde locks were styled into a sleek middle-part low pony, revealing the lace detailing around the neck of the gown. 

The beautiful summery dress was adorned with exquisite pink and blue flowers, as well as flashes of green and orange. 

Desert beauty: Vanessa Hudgens also showed off her elegant fashion sense at the event on Friday near Joshua Tree National Park

Desert : Vanessa Hudgens also showed off her elegant sense at the event on Friday near Joshua Tree National Park

Sunny style: The 32-year-old Spring Breakers star flaunted her enviable curves in a stunning halter sundress from Adriana Iglesias

Sunny style: The 32-year-old Spring Breakers star flaunted her enviable curves in a stunning halter sundress from Adriana Iglesias

Tying in with his wife's look, Evan, the son of music legend Diana Ross, wore a crisp white double-breasted blazer.

He paired the unbuttoned jacket with a chunky necklace, some blue straight leg trousers and brown loafers.  

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A host of other celebrities attended the event, including Vanessa Hudgens who flaunted her enviable curves in a stunning halter sundress from Adriana Iglesias.

Eye catching: The backless white dress reached down to her ankles and was decorated with stylishly faded floral patterns

Eye catching: The backless white dress reached down to her ankles and was decorated with stylishly faded floral patterns

Vanessa did her best to cut down on her sun exposure with a white parasol

Vanessa did her best to cut down on her sun exposure with a white parasol

The backless white dress reached down to her ankles and was decorated with stylishly faded floral patterns. 

Her tied collar featured long strands dangling down her back, and she paired the dress with beige heels.

The High School Musical star wore her lustrous raven tresses in a high ponytail that dangled all the way down her back. 

She added extra sparkle to her look with dangling gold hoops with tear-drop shaped pearls.

Vanessa also did her best to cut down on her sun exposure with a white parasol.

She arched her neck and placed her hands on her head to showcased her copper-colored makeup in an Instagram post taken from the event.

Gorgeous: She arched her neck and placed her hands on her head to showcased her copper-colored makeup in an Instagram post taken from the event

Gorgeous: She arched her neck and placed her hands on her head to showcased her copper-colored makeup in an Instagram post taken from the event

Success: 'Launching @caliwater at our caliwater escape was pure magic,' she wrote. '@olivertrevena @ggmagree we done did it. thanks to everyone who¿s apart of the ride ¿¿.'

Success: 'Launching @caliwater at our caliwater escape was pure magic,' she wrote.

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