She is the fifth MP for the Bay of Plenty region. She joins Simon Bridges (National, Tauranga MP), Todd Muller (National, Bay of Plenty MP), Clayton Mitchell (New Zealand First, list MP) and Jan Tinetti (Labour, list MP) in Parliament.
Mrs Warren-Clark said it was nerve-racking waiting to find out if she would be heading to Parliament.
"I'm absolutely delighted," she told the Bay of Plenty Times this afternoon.
She said she had just arrived home after doing a television interview in Auckland.
"It still feels quite surreal."
She said she was looking forward to heading to Parliament for a new MPs' induction course on Tuesday and would also be attending a Labour caucus meeting.
Mr Muller said "it can only be a good thing" there would now be five MPs in Parliament to represent the Tauranga and Bay of Plenty electorates.
"There is a firm muster now, all aspects of political persuasion are covered," he said, adding, "except the Greens, who have never done very well in this region."
Mr Muller said he was happy for Mrs Warren-Clark because the pair had known each other for more than 25 years since they went to Waikato University together.
"She's a great person, she's got great values and I think she will do really well down in Wellington."
Mr Mitchell said he was "not shocked" by the results but would have liked to have seen his party gain a little more of the percentage.
He said the results of the special votes did not have a huge effect for the party.
"It doesn't change anything, what we've got now is the certainty to start making decisions."
The total number of votes cast in New Zealand, including special votes, was 2,630,173 and 47 per cent of votes were cast in advance.
Labour Leader Jacinda Arden said: "We congratulate Angie Warren-Clark on becoming Labour's 14th additional MP, which expands the Labour caucus to 46 MPs.
"Angie brings valuable experience to our team through her role helping the most vulnerable in her community as manager of Tauranga's Women's Refuge. She will also strengthen Labour's presence in the Bay of Plenty."