The 58-year-old Without A Trace star confirmed the news at the YSL Beauty Club event, where a newly blonde Alexandra was pictured showing off a dazzling diamond ring from Anthony - who also appeared to be sporting a revamped hair do.
Clearly besotted, the pair – who have been dating since 2015 – packed on the PDA at the Melbourne event.
The Aussie actor split from former wife Gia Carides in March 2015, and announced he was dating Alexandra three months later.
Anthony and Gia now both share custody of their 15-year-old daughter Bridget.
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