"No woman should ever be restricted from making decisions about her own body," he added.
In a subsequent tweet, Timberlake said that "no one should EVER be held against their will… or ever have to ask permission to access everything they've worked so hard for". He also sent a message of support on behalf of his wife, actress Jessica Biel.
"Jess and I send our love, and our absolute support to Britney during this time. We hope the courts, and her family make this right and let her live however she wants to live," he wrote.
Justin and Britney's highly publicised teen romance, which first blossomed at Disney's The Mickey Mouse Club, came to an end in 2002, with Justin accusing Britney of infidelity in interviews that followed. The music video for his 2002 song Cry Me a River went on to feature the narrative he was pushing, with a Britney lookalike portrayed cheating on him.
In recent months, following documentaries about Britney's unfair treatment at the hands of the tabloid press, fans have turned on Justin for how he spoke about her at the time, including revealing to the world that they had slept together amid a sickening public obsession with Britney's virginity.
In February, Timberlake apologised for his past actions, but many remarked that it was too little, too late.
- With news.com.au