The Maleficent actress and Brad Pitt confirmed that they had become engaged last month.
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The Daily Star quotes an insider as saying: "Angelina has finally accepted that maybe she looks too thin. She's decided she'd like a more shapely figure when she weds Brad and is hoping to gain ten pounds.
"Brad and Ange have asked Jamie to suggest some recipe ideas for them.
"Ange never cooks so Brad's now knocking up some English dishes like shepherd's pie and bangers and mash."
The source added: "Brad would love her to have curves like she did when they met on Mr & Mrs Smith."
The couple have reportedly turned to Oliver in the past for culinary help, with Pitt taking cooking lessons from him in 2011.
