The celebrity trainer, who has lost a whopping 25kg since the birth of her first child, son Arnold, who was welcomed in September.
The 33-year-old posed with her mum, 61, in a matching swimsuit, showcasing their matching abs.
She captioned, 'Mum and I accidentally bought the same swimmers 😂👙
'TIFFXO gets results at every age and stage of fitness ✌️️ tiffxo.com'
The two could be sisters!
Fans were quick to flood the picture with compliments.
'Whoa you both look amazing!!' one wrote, with another agreeing, 'You both look fantastic.'