Over on Instagram, the loved-up couple shared a glimpse inside their latest family outing which involved a tranquil walk amid the autumn leaves.
Little Mia looked every inch the doting sister as she sweetly tended to her little brother who was bundled up in a cosy romper and a white, crochet blanket.
In a separate clip, Gorka, 33, could be seen pushing Thiago in a pram whilst Mia held on tightly with her feet on a raised buggy platform.
The lovebirds appeared to relish their outdoor adventure and posted a separate selfie of themselves soaking up the sunlight. Hits radio host Gemma was all smiles in a mustard yellow beanie and a black jacket, whilst Gorka looked cool in a puffer coat and a pair of oval sunglasses.
Captioning the images, Gemma penned: "Autumn strolls @gorka_marquez," followed by a string of autumnal-themed emojis.
Fans and friends flocked to the comments section to share their thoughts, with one writing: "Aww they look so alike now," while another chimed in: "Such a beautiful family nice to see you out altogether."
A third remarked: "Beautiful family photos Nothing better than a walk in [the] autumn fresh air beautiful," and a fourth sweetly added: "It's the simple things."
Gemma and Gorka welcomed their second family addition back in July. Announcing Thiago's arrival into the world, Gemma shared: "Little man is here! He arrived safe and sound and he's utterly wonderful. Mia is already the mother hen we expected her to be [laughing face emoji]."
The doting mum added: "We're all home together soaking up this lovely bubble before Gorks has to leave for Strictly rehearsals next week. Thank you for all your lovely wishes. Our family is complete."
Gemma has since opened up about little Thiago's sweet bond with his sister Mia. During an exclusive chat with HELLO! magazine, she said of Mia: "She's like mother hen; she's obsessed with him. She mucks in helping with the nappies and helps me get him dressed, which sometimes results in it taking a little bit longer than if I'm doing it on my own, but I just love the fact that she's so into him."
She continued: "I hope they don't feel pushed out or like they've been replaced or anything like that', and thankfully she's taking it all in her stride, bless her. I think a lot of people think your love has to be split [between kids] but for me it's not, it's doubled. It's not like cut in half, it's doubled."