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First regeneration: Seen in "The Tenth Planet"

Second regeneration: Seen in "The War Games"

Third regeneration: Seen in "Planet of the Spiders" (Reprise seen in "Robot")

Fourth regeneration: Seen in "Logopolis" (Reprise seen in "Castrovalva")

Fifth regeneration: Seen in "The Caves of Androzani"

Sixth regeneration: Seen in "Time and the Rani"

Seventh regeneration: Seen in "Doctor Who" (The TV Movie)

Eighth regeneration: Seen in "The Night of the Doctor"

Ninth regeneration: Seen in "The Day of the Doctor"

Tenth regeneration: Seen in "The Parting of the Ways"

Eleventh regeneration: Seen in "The Stolen Earth" and "Journey's End" (The Doctor didn't change appearance, but it still qualifies as a regeneration.)

Twelfth regeneration: Seen in "The End of Time"

Thirteenth regeneration: Seen in "The Time of the Doctor"

Thus, the Doctor has regenerated thirteen times. Usually, a Time Lord can only regenerate twelve times, but the Doctor was given an extra cycle (in "The Time of the Doctor", after Clara did a bit of shouting) as a way of thanking him for saving Gallifrey from the Time War.