The 30-year-old beat Jay Mckray in the final public vote to emerge victorious from Channel 5's inaugural series of the reality show. He will take home £50,000 in prize money, plus the £990 he received as part of last week's twist.
The boys held hands as they waited on the sofa for host Brian Dowling to announce the result, which was met with a sizeable smattering of boos.
Aaron gasped and appeared to be on the verge of tears as he jumped up to hug Jay goodbye.
> Big Brother winner Aaron Allard-Morgan: 'I wasn't playing a game'
When Dowling spoke to Aaron again later amid a chorus of jeers, the father-of-one noted: "They don't sound happy do they?"
Watch Aaron Allard-Morgan leave the Big Brother house as champion below:
He nervously lingered at the bottom of the stairs, muttering "they hate me", before eventually sprinting up to the front doors to meet the public.
As he stepped out of the Elstree compound, Aaron was hit with a wall of boos while fireworks, confetti and smoke erupted around him. Once at the stage below, Dowling handed him a briefcase containing his prize money.
Alex Rose and Louise Cliffe finished third and fourth respectively earlier in tonight's final, while Tom O'Connell was evicted yesterday.
Digital Spy readers also voted Aaron as the winner of this year's Big Brother in our exclusive poll.
> Big Brother Jay Mckray finishes runner-up: 'I'm in love with Louise'
> Big Brother's Alex Rose: 'I pushed for my Big Brother dream'
> Big Brother's Louise Cliffe: 'I want to marry Jay Mckray'
> Big Brother: The Final - Live Blog
Watch Aaron Allard-Morgan's Big Brother best bits below: