All grown up! Muscular Shannon Noll strolls through Sydney Airport with musician son Blake, 21, as father-son duo tour together

Shannon Noll was spotted at Sydney Airport on Monday alongside his heartthrob son Blake.

The pair were in WA for Shannon’s That’s What I’m Talking About 20th Anniversary Tour.

Shannon showed off his muscular gear in a tight blue logo T-shirt and gray cargo pants.

He completed his look with a cool gray cap and headphones.

The Australian Idol favorite looked every bit the Aussie rocker and even gave a thumbs up as he made his way through the airport.

Shannon Noll (left) was spotted at Sydney Airport on Monday with his heartthrob son Blake (right).

Blake, 21, who performs a set at each show, also opted for a casual ensemble for the flight.

The youngster wore a gray Dickies hoodie and tan cargo pants.

He completed the look with a stylish cap placed over his shoulder-length locks.

Shannon’s tour kicked off in April this year when his first gig hit Queensland’s Sunshine Coast.

The pair were in WA for Shannon's That's What I'm Talking About 20th Anniversary Tour

The pair were in WA for Shannon’s That’s What I’m Talking About 20th Anniversary Tour

Ahead of the tour, Shannon revealed that Blake would be joining him for the two-month stint as a supporting act.

“We’re talking about (Blake) doing a few support slots during this run, so that will be interesting,” he told 9honey Celebrity at the time.

“It would be great for him… he’s really ready for the next step and really wants to take it.”

The Australian Idol favorite looked every bit the Aussie rocker and even shared a thumbs up as he made his way through the airport

The Australian Idol favorite looked every bit the Aussie rocker and even shared a thumbs up as he made his way through the airport

Shannon showed off his muscular gear in a tight blue logo T-shirt and gray cargo pants

Shannon showed off his muscular gear in a tight blue logo T-shirt and gray cargo pants

The pair will perform in Toowoomba on Friday before embarking on the national tour to Melbourne, Warragul and Tamworth.

More shows are expected to be announced soon.

Last January, Shannon and Blake played the Tamworth Music Festival and fans even demanded ‘heartthrob’ Blake’s autograph.

Blake, 21, also opted for a casual ensemble for the flight, wearing a gray Dickies hoodie and tan cargo pants

Blake, 21, also opted for a casual ensemble for the flight, wearing a gray Dickies hoodie and tan cargo pants

“I think the heartbreak days are long gone for me,” Shannon previously said women’s Day with a laugh, adding that he would like to pass the baton to his son.

Blake, an apprentice tradie, said he started playing guitar at the age of 19 and was always a little nervous about singing and performing in front of his famous father.

“Once I realized that singing is more of a muscle, and gets stronger and better the more you do it, I kept doing it in the car and started to believe in myself more, and then I started learning guitar, because I knew that I would sing more when I played,” he explained.

Shannon's tour kicked off in April this year when his first gig hit Queensland's Sunshine Coast

Shannon’s tour kicked off in April this year when his first gig hit Queensland’s Sunshine Coast