Sandra Bullock is “doing okay” as she celebrates her 60th birthday. The Hollywood star announced the passing of Bryan Randall – her long-time partner – back in 2023, but Sandra has managed to retain an upbeat outlook on life. A source told PEOPLE: “She’s doing okay now. “Her kids are amazing. She’s very happy to be a mom.” The movie star – who has two children, aged 11 and 14 – is grateful for all of the support she’s recently received. The insider shared: “Her friends gave her the support that she needed both during his illness and afterwards. She is grateful for all the love. “Everyone helpe…