Brian Austin Green looked every inch the doting dad on an outing with his Noah, Bodhi, and Journey River on Saturday in Malibu, California. While shopping for pet supplies with his children, who he shares with his estranged wife Megan Fox, the actor, 48, sported a white t-shirt, charcoal grey shorts and a black baseball cap. During his outing the father-of-four, who also shares a 19-year-old named Kassius with his ex Vanessa Marci, held onto a blue surgical mask. Running errands: Brian Austin Green looked every inch the doting dad as he took his three kids Noah Shannon Green, Bodhi Ransom Green and Journey River Green The star's little ones stayed close to his side as they ran errands with Green, who is currently dating Dancing with the Stars pro Sharna Burgess. In June, the 90210 alum shared a rare photo with all four of his kids in the pool, taken by Burgess, 36. Kassius smiled softly and had his arm over his father's shoulders, while his son Bodhi, seven, sat on his lap and his other sons Journey, four, and Noah, eight, relaxed on his other side. Busy dad: While running errands with his children, who he shares with his estranged wife Megan Fox, the 48-year-old actor showed off his lean physique in a white t-shirt, charcoal grey shorts and a black baseball cap 'Happy Father's Day everyone!!!' Brian gushed in his caption. He also added a loving message to Sharna. 'Thank you baby for taking such an amazing pic for me :)).' Proud papa: In June, Green celebrated Father's Day with a rare family photo featuring his three youngest sons with Megan Fox and his oldest son Kassius (L) from his relationship with Vanessa Marcil Although it's not unusual for Brian to spend time with his three youngest children, it appears to be much rarer for him to spend time with Kassius. His ex Vanessa previously claimed on Instagram in 2018 that Kassius had barely seen his father or then-stepmother Megan Fox in years and that his bedroom at their home had been emptied out. Back in September of last year, she wrote in Instagram comments that her son had been ostracized from Brian's family with Megan Fox for years. 'I celebrate Kassius’ love for his father and remain extremely grateful that Kass was finally invited back into his father’s life and was able to meet his youngest brother for the first time & finally start seeing his other two siblings again,' she wrote. '5 years apart with no explanation is devastating for children. For siblings. My son is also an incredible & protective big brother.' She also wrote elsewhere that Kassius used to have a bedroom at the home Brian and Megan shared, but she claimed that it was repurposed once he stopped being invited. Sweet: Sharna praised the parents on Australia's The Morning Show earlier this year, saying they were 'doing a great job with managing their situation, so I’m grateful that I’ve been able to fit into it — into their world' Although Brian's ex may not care for his parenting in recent years, his new girlfriend has nothing but praise for him. During an appearance on Australia's The Morning Show earlier this year, the professional dancer said Brian and Megan were 'doing a great job with managing their situation, so I’m grateful that I’ve been able to fit into it — into their world.' She added that Brian was 'a wonderful dad, and he and his wife — uh, ex-wife — have raised three beautiful children, and they are so wonderful and sweet and kind and considerate, and they’ve done such an amazing job.' New love: Since his split from Megan in May 2020, she has moved on with rapper and rocker Machine Gun Kelly, whom she met while filming Midnight In The Switchgrass in March 2020; seen in May in LA Brian has had a tumultuous relationship with Megan, which began in 2004 after they met on the set of Hope & Faith when he was 30 and she was only 18. After breaking off an engagement, they got back together and were married in 2010. The Transformers actress later filed for divorce in 2015, though they reconciled the following year. Things ended for good in May of last year, when Brian announced their separation. Now his ex is coupled up with rapper and rocker Machine Gun Kelly, whom she met on the set of the crime film Midnight In The Switchgrass, which began filming in Puerto Rico in March 2020, shortly before the pandemic forced a pause of production. After dating around following the split with multiple women, including the recently engaged Courtney Stodden, Brian went official with Sharna in January, a month after they took a Hawaiian vacation. All rights reserved for this news site (dailymail) and under his responsibility