WHIRLWIND: The couple have been dating for seven months [SPLASH]
A source told Us Weekly: "Everyone thinks it's wild but are so happy for them. Benji always tends to fall in love easily, but this time it's for real and he landed a great girl.
"They obviously both make each other incredibly happy and there's nothing better than that."
Cameron started dating 35-year-old Good Charlotte guitarist in May.
HISTORY: Cameron dated Justin for three years [WENN] Miss Diaz has previously been outspoken about not aiming for marriage and 2.4 children, saying: "I'm not looking for a husband or marriage or not not looking for that stuff.“They obviously both make each other incredibly happy”A source close to the couple
"I'm living, not thinking what I should or shouldn't be doing with my life.
"If a family happens, then it happens. If children come to me, then I would do that, but I’m not someone who feels like she has to do something because it’s expected."
POPULAR: Benji previously dated Eliza for a year [WENN] Meanwhile, Benji was previously engaged to Australian babe Sophie Monk, and most recently dated Eliza Doolittle.
If the engagement rumours are true, Cameron will gain a sister-in-law in Nicole Richie – the fashionista is married to Benji's twin brother, Joel.
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