Daniel Dutfield, 24, had stormed out of the baby shower because he was upset at the low turnout to the party.
"This is a totally tragic case. Everyone is agreed that this was a freak accident with totally, dreadfully, tragic consequences"
He got behind the wheel of his Ford Focus and sped off, accelerating up to 60 miles an hour around the estate in Morden, Surrey.
As his 22-year-old wife-to-be Jessica came out to see what was happening, Dutfield lost control around a corner and ploughed into her.
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Their unborn baby girl was dead on arrival at hospital and Jessica Fenner tragically died the next day.
Dutfield, who had been with Jessica for six years, wept as he pled guilty to causing death by dangerous driving at Croydon Crown Court.
He was jailed for four and a half years, ordered to pay a £120 surcharge and banned from driving for seven years.
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Passing sentence, the Recorder of Croydon Judge Warwick McKinnon said: "This is a totally tragic case. Everyone is agreed that this was a freak accident with totally, dreadfully, tragic consequences.
"However you drove drunkenly, aggressively, and at speed, in a residential area. Children could have quite easily been present. It's a tragic case, you killed the one you love."
In the months prior to her tragic death Miss Fenner, a shop assistant at hardware store Wilkinson's, told family and friends of how excited she was to have moved in with her boyfriend and start a family.
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On May 31st, the mum-to-be wrote: "Had a lovely evening with Dan Dutfield - not long till us 2 become 3 can't wait to meet our beautiful baby girl xx."