'Up and running!' Kim Zolciak shows off her midriff in cropped top and leggings for lunch at son's school

She's never shy about showing off her surgically-enhanced body. 

And Kim Zolciak was back to doing what she does best on Tuesday, taking a mirror selfie which flaunted her toned tummy. 

The 38-year-old reality television star shared a Snapchat video explaining she was heading to meet her son Kroy Jagger, 5, for lunch at school. 

Showing off: Kim Zolciak was back to doing what she does best on Tuesday, taking a mirror selfie which flaunted her toned tummy

Showing off: Kim Zolciak was back to doing what she does best on Tuesday, taking a mirror selfie which flaunted her toned tummy

'Off and running you guys. I'm actually gonna go to KJ's school and surprise him and have lunch with him today.  I know he's gonna be super stoked, ' she told the mirror.

Her blonde hair was loose around her shoulders and she added giant dark glasses.  

She later showed KJ tucking into a bowl of lettuce, as she commented: 'I love that my little man gets a salad. They have the best food at his school. It's all organic, huh? That's the life, man.'

Toned tummy: The 38-year-old reality television star shared a Snapchat video explaining she was heading to meet her son Kroy Jagger, 5, for lunch at school

Toned tummy: The 38-year-old reality television star shared a Snapchat video explaining she was heading to meet her son Kroy Jagger, 5, for lunch at school

The Real Housewives of Atlanta star also shamelessly plugged a nutrition shake. 

The star recently boasted of how proud she is of her impressive physique. 

'This body birthed 6 kids and I'm damn proud!' she wrote on social media. 

She went on to add how closely the last of her brood were born in succession: '4 kids in 30 months!!' 

School run: 'Off and running you guys. I'm actually gonna go to KJ's school and surprise him and have lunch with him today. I know he's gonna be super stoked, ' she told the mirror

School run: 'Off and running you guys. I'm actually gonna go to KJ's school and surprise him and have lunch with him today. I know he's gonna be super stoked, ' she told the mirror

Making ends meet: The Real Housewives of Atlanta star also shamelessly plugged a nutrition shake 

Making ends meet: The Real Housewives of Atlanta star also shamelessly plugged a nutrition shake 

Kim has spent thousands on surgery and also regularly has fillers in her lips to increase their size - and has even introduced her teen daughter Brielle to the procedure. 

The pair fly across the country from their Atlanta home to Los Angeles to visit doctor-to-the-stars Simon Ourian.

Kim has daughters Brielle and Ariana from her first marriage to Dan Toce from 2001 to 2003.  

Mom duties: She later showed KJ tucking into a bowl of lettuce, as she commented: 'I love that my little man gets a salad. They have the best food at his school. It's all organic, huh? That's the life, man'

Mom duties: She later showed KJ tucking into a bowl of lettuce, as she commented: 'I love that my little man gets a salad. They have the best food at his school. It's all organic, huh? That's the life, man'

She married former Atlanta Falcons football player Kroy Biermann in 2011, a year after meeting. 

They have four children together: Kroy Jagger (KJ), Kash, and twins Kane and Kaia. 

Kroy has also adopted her daughters.  

He played for Atlanta Falcons for eight seasons before signing a new one-year contract with the New York-based team Buffalo Bills. 

But head coach Rex Ryan had to cut the roster of players down from 74 to 53.

Family visit: On this week's Don't Be Tardy she went to the animal rescue centre with Kroy, Ariana, Brielle and Tracey

Family visit: On this week's Don't Be Tardy she went to the animal rescue centre with Kroy, Ariana, Brielle and Tracey

Biermann didn't make the cut and was axed with the team midway through training camp, just three weeks after signing.

The reality mum recalled on Friday how her 'life changed' after suffering a stroke while she was a contestant on Dancing With the Stars a year ago. 

On this week's Don't Be Tardy the family adopted a puppy.  

Against it: Kroy was against the family getting another puppy and made sure Brielle knew she was responsible for Norma Jean

Against it: Kroy was against the family getting another puppy and made sure Brielle knew she was responsible for Norma Jean

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