Sofia Richie keeps it casual in black cropped top and sweatpants while grocery shopping with gal pal Pia Mia in LA

She had a fun travel-filled summer during which she celebrated her 21st birthday and other happy occasions with family, famous friends, and her older boyfriend.

Sofia Richie was spotted in Calabasas on Tuesday heading back to her car with groceries from local chain Ralph's, in a cute black polo-style crop top that showcased the starlet's taut midriff.

Sofia's gal pal Pia Mia was along for the ride as well, in a similarly tight and even more revealing black crop top that revealed her teeny tiny waist and had the word 'baller' written on the front. 

Getting groceries: Sofia Richie was spotted in Calabasas on Tuesday heading back to her car with groceries from local chain Ralph's in a cute black polo-style crop top

Getting groceries: Sofia Richie was spotted in Calabasas on Tuesday heading back to her car with groceries from local chain Ralph's in a cute black polo-style crop top

Sofia's shirt had diagonal buttons that went to the side of her bust, and she wore ovular shades and a gold-chained purse across her frame.  

Both girls opted for big baggy pants to go with their petite tops, with Richie in the grey sweatpants featured in her collection collaboration with fashion label Missguided, which launched on Tuesday as well. 

Mia's pants were more of the sporty baggy cargo variety, which she paired with gold accented sneakers. 

Pretty in the parking lot: Sofia's gal pal Pia Mia was along for the ride, in a tight and even more revealing black top that revealed her teeny waist and had the word 'baller' written on the front

Pretty in the parking lot: Sofia's gal pal Pia Mia was along for the ride, in a tight and even more revealing black top that revealed her teeny waist and had the word 'baller' written on the front

Shenanigans: Richie documented their activities in the store on her Instagram stories

Shenanigans: Richie documented their activities in the store on her Instagram stories

Posing for the security cameras: The girls joked around and struck a pose in aisle 7

Posing for the security cameras: The girls joked around and struck a pose in aisle 7

Sofia had on simple white kicks, and both girls wore their blond tresses down.

Richie posted snippets from their shenanigans inside the grocery store—getting limes, perhaps for a party—to her Instagram story.

Sofia talked up the sweatpants she was wearing on her Instagram stories as well, along with a sizzling promotional video for her Missguided line featuring the daughter of Lionel Richie in various increasingly revealing and racy garments from the line. 

Falling out: On the same day, Sofia shared to both her feed and stories a sizzling promotional video for her Missguided collab in various increasingly revealing garments from the line

Falling out: On the same day, Sofia shared to both her feed and stories a sizzling promotional video for her Missguided collab in various increasingly revealing garments from the line

Chic: The opening look in the video was a plunging snakeskin trench coat

Chic: The opening look in the video was a plunging snakeskin trench coat 

Daring: One of the most daring looks from the line had the girlfriend of Scott Disick literally falling out of an open black trench style top

Daring: One of the most daring looks from the line had the girlfriend of Scott Disick literally falling out of an open black trench style top

One of the most daring lewks from the line, which is titled Sofia Richie x Missguided, had the girlfriend of Scott Disick literally falling out of an open black trench style top, that was (barely) held together with a belt.

Another look had Richie in an incredibly short lime green mini dress, with camera angles to underscore the shortness of the garment.

She captioned the promo video with: 'Here we go!!!! My collection is now live with @missguided #sofiarichiexmissguided' 

Pop of color: The bright dress featured long sleeves and a shorter-than-short hem
Whoa: The camera angle underscored the shortness of the garment

Don't be green with envy: Another look had Richie in an incredibly short lime green mini dress

Model behavior: Sofia worked the cameras for her Missguided promo shoot

Model behavior: Sofia worked the cameras for her Missguided promo shoot

Sofia Richie keeps it casual in black cropped top and sweatpants at LA grocery with gal pal Pia Mia

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