Brian Austin Green's ex-fiancée Vanessa Marcil sided with his newly-estranged wife Megan Fox, and detailed the 'complete devastation' he put her and their son Kassius through in their ongoing 13-year court battle.

Marcil - who boasts 153K Instagram followers - wrote: 'Megan finally living her life for herself is in itself a gift to her children.'.

Gloves are off: Brian Austin Green's ex-fiancée Vanessa Marcil (L) sided with his newly-estranged wife Megan Fox (2-R), and detailed the 'complete devastation' he put her and their son Kassius through in their ongoing 13-year court battle.

In 2006, Green and his former Beverly Hills, 90210 castmate began their bitter court battle for full custody of their 18-year-old son Kassius leading to him sue her in 2012 over $200K he allegedly 'lent her.'.

Not amicable: In 2006, Green and his former Beverly Hills, 90210 castmate (L) began their bitter court battle for full custody of their 18-year-old son Kassius (R) leading to him sue her in 2012 over $200K he allegedly 'lent her' (pictured August 1)

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