Bisexual actor Alan Cumming announced last night he had married his partner Grant Shaffer in New York, adding to their British civil partnership.

The pair celebrated the fifth anniversary of their civil union by marrying in the US state, the sixth in the union to allow the ceremonies.

Cumming, originally from Scotland, announced the news on micro-blogging site Twitter with a special message for Republican presidential candidacy hopeful Rick Santorum.

He wrote: “I just got married!!!!! On the 5th anniversary of our wedding in London grant and I tied the knot again in NYC!!! #eatmericksantorum. [sic]”

Santorum was booed last week for his anti-gay comments ahead of the New Hampshire primary, as the race for the Republican presidential nomination gets under-way.

Cumming, who will be appearing this year as both Macbeth and Lady Macbeth in a Glasgow production of the Scottish play, now lives in New York City with Shaffer and their two dogs.

Last year, he criticised figures from his industry who recommended young actors stay in the closet.

He said: “I always think about a little gay boy in Wisconsin or a little lesbian in Arkansas seeing someone like me, and if I cannot be open in my life, how on earth can they?”