Jennifer Aniston has taking her foot off the gas when it comes to working out and has reckons that her weight gain has caused so many pregnancy rumours.

The 45-year-old actress, who is engaged to fellow actor Justin Theroux, was known for her strict work out regimes but she has now cut back on working up a sweat in the gym to give herself a “little break”.

Talking to Look magazine, Jen said: ''For the last year and a half I went from being a crazy workout girl to sort of saying, 'My body wants a little break.'

''The only downside to that of course is that there's that couple of extra pounds and 4,000 pregnancy rumours too, but you know, other than that, it all feels great.''

Jen, who has been at the centre of Oscar buzz with her new movie Cake, credits her “good genes” for her youthful appearance and says that she’s “blessed.

''I don't really have any special regimen as such. I think I'm blessed with good genes, which kind of helps,” she said.

''Whenever I look at my dad I kind of marvel at how he has hardly any wrinkles and he's now 81, so I'm sure I've benefitted from that and my Greek heritage.