Country crooner Maren Morris and R&B belter Tinashe glam up to headline SHEIN ...

Country crooner Maren Morris and R&B belter Tinashe were among the five headliners performing at SHEIN Together Fest, which livestreamed Sunday at 2pm PST via the SHEIN app.

The 31-year-old Grammy winner dressed her post-baby body in a crochet halter, black pencil skirt, and white gladiator heels from the fast e-commerce platform founded in 2008.

'I feel like I probably wear more high-waisted stuff now, but I definitely also - after my son,' Maren admitted to People last Friday.  

'#SHEINpartner': Country crooner Maren Morris was among the five headliners performing at SHEIN Together Fest, which livestreamed Sunday at 2pm PST via the SHEIN app

'#SHEINpartner': R&B belter Tinashe was among the five headliners performing at SHEIN Together Fest, which livestreamed Sunday at 2pm PST via the SHEIN app

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'#SHEINpartners': Country crooner Maren Morris (L) and R&B belter Tinashe (R) were among the five headliners performing at SHEIN Together Fest, which livestreamed Sunday at 2pm PST via the SHEIN app

'We're always extremely pressed to erase any evidence on our body that we had a child - that we housed a child for nine, 10 months - so I just realized how unhealthy that was for me and my workout journey to be like, "I need to get back to where I was before." That's not really the goal - that shouldn't be the goal, to just sort of erase the fact that you had a kid.'

Hairstylist Marwa Bashir coiffed Morris' ombré tresses and make-up artist Lorrie Turk made sure she was ready for her close-up.

The You All Over Me songstress sang a few songs, including her 2019 hit The Bones.

Maren - who boasts 3.2M social media followers - wrote of the concert: 'SHEIN is graciously donating $300K to NAACP Legal Defense Fund, Together We Rise, and Ecologi.'  

Two-tone ensemble: The 31-year-old Grammy winner dressed her post-baby body in a crochet halter, black pencil skirt, and white gladiator heels from the fast fashion e-commerce platform founded in 2008

Two-tone ensemble: The 31-year-old Grammy winner dressed her post-baby body in a crochet halter, black pencil skirt, and white gladiator heels from the fast e-commerce platform founded in 2008

Maren admitted to People last Friday: 'I feel like I probably wear more high-waisted stuff now, but I definitely also - after my son...I just realized how unhealthy it was for me and my workout journey to be like,

Maren admitted to People last Friday: 'I feel like I probably wear more high-waisted stuff now, but I definitely also - after my son...I just realized how unhealthy it was for me and my workout journey to be like, "I need to get back to where I was before." That's not really the goal - that shouldn't be the goal, to just sort of erase the fact that you had a kid'

Showing off her ink: Hairstylist Marwa Bashir coiffed Morris' ombré tresses and make-up artist Lorrie Turk made sure she was ready for her close-up

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Showing off her ink: Hairstylist Marwa Bashir coiffed Morris' ombré tresses and make-up artist Lorrie Turk made sure she was ready for her close-up

Warming her pipes: The You All Over Me songstress sang a few songs, including her 2019 hit The Bones

Warming her pipes: The You All Over Me songstress sang a few songs, including her 2019 hit The Bones

Maren - who boasts 3.2M social media followers - wrote of the concert: 'SHEIN is graciously donating $300K to NAACP Legal Defense Fund, Together We Rise, and Ecologi'

Maren - who boasts 3.2M social media followers - wrote of the concert: 'SHEIN is graciously donating $300K to NAACP Legal Defense Fund, Together We Rise, and Ecologi'

Morris and her husband Ryan Hurd welcomed their first child, son Hayes Andrew, by emergency C-section 13 months ago.

The Chasing After You couple wed three years ago after meeting in 2013 while co-penning Tim McGraw's 2014 track Last Turn Home.

Maren will next compete for two trophies - best country artist and best country song - at the eighth annual iHeartRadio Music Awards, which air May 27 on Fox. 

Meanwhile, Tinashe flaunted her fit 5ft5in figure in a black bra-top, matching pleated mini-skirt, and Victorian-inspired booties selected by stylist Katie Qian. 

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