Although the lovebirds only went public with their romance last month, when 36-year-old Andrew accompanied singer Katherine to collect her OBE from Buckingham Palace, they have reportedly been dating since last October.
The Welsh classical singer, 33, is said to have accepted the film director's proposal last week but kept it under wraps until now.
Katherine's publicist confirmed the news to The Daily Express, stating: "I can confirm that Katherine is engaged to Andrew Levitas."
According to the Mail Online, Katherine was "thrilled and surprised" by the proposal.
She has since thanked fans on Twitter, with the message: "Thank you for all your lovely wishes of congratulations. They mean so much to us. Happy Easter!"
She was previously engaged to TV presenter Gethin Jones but the pair split up in 2011.
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Watch the official music video to Katherine Jenkins' 'Break It To My Heart':