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The Eleventh Doctor didn't give up his last regeneration in "The Impossible Astronaut". He was already out of regenerations & the apparent regeneration on the beach was entirely faked (by the Teselecta, as revealed in "The Wedding of River Song"). The full explanation of why the Doctor was out of regenerations wasn't given until "The Time of the Doctor", when he explained it to Clara.

As the Doctor also said in "The Time...", the regeneration seen then (into the Twelfth Doctor, played by Peter Capaldi) was the first of a new cycle, which was granted by the Time Lords in that episode.