The BAFTA-winning ITV2 series was rewarded in the categories of 'Best Entertainment Show' and 'Best Non-Competition Reality Show'.
Beautician Amy Childs, who features in the programme, received the accolade of 'Reality Personality of the Year'.
Recent reports have suggested that reality shows including Strictly Come Dancing, I'm A Celebrity... Get Me Out Of Here! and Big Brother are in competition to secure Childs as part of their new series lineups.
> The Only Way Is Essex: Did it deserve a BAFTA?
Other winners at Wednesday evening's ceremony in London included BBC One's The Apprentice, which triumphed in the 'Best Business Show' category.
Panellist Karren Brady also beat nominees including Cheryl Cole, X Factor judge Louis Walsh and MasterChef's Gregg Wallace to win the title of 'Best Reality TV Judge'.
Keeping Up with the Kardashians was crowned 'Best International Reality TV Show' and Jamie Oliver's Dream School was named 'Best Social Experiment Show'.
> National Reality TV Awards 2011: The winners in full