Katharine McPhee 'can't wait to marry' David Foster, notes stars are 'far away from each other'

Katharine McPhee had a message for the haters criticizing her engagement to David Foster. (AP)

Distance is making Katharine McPhee's heart grow fonder.

The "American Idol" alum posted a sultry photo directed towards her famous fiance on Sunday night.

"Far away from each other but still can't wait to marry you," McPhee, 34, gushed on her Instagram Story while tagging fiance David Foster, 69. The singer also casually showed off her massive engagement ring in the post.

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The music producer got the sweet message and reposted it on his Instagram writing, "I won the lottery!"

McPhee is in London where she's starring in the musical "Waitress" in the city's West End.

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The New York Post reported over the weekend that the couple plan to marry this summer in London after McPhee fell in love with the European city.

"She really wants to get married and doesn’t want to wait," a source told the outlet.

It will be the second and fifth marriages for the bride and groom, respectively.