Cult
Bethan Britton, who works as a contracts assistant at a BBC office in Cardiff, was first linked to the Doctor Who actor in November.
"I am seeing David and am extremely happy," Bethan told The People. "He's a great guy and I love being with him. It's a serious relationship. Things are going well."
Britton added that she has been dating David for "a few months".
Tennant split from Thunderbirds actress Sophia Myles in October.
More: Cult, Doctor Who
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