Jennifer Aniston plans to have a mini nip-and-tuck before George Clooney’s starstudded fall wedding – sources are saying – because she’s so freaked out about running into ex-husband Brad Pitt!

Sources say the former “Friends” beauty, 45, is still tormented by the “Moneyball” hunk – nine years after their divorce stunned Hollywood and he ran off with Angelina Jolie.

Jen and Brad, 50, are both on the guest list for Clooney’s September nuptials, along with their current partners, Justin Theroux, 42, and “Maleficent” beauty Angelina, 39.

To boost her confidence before the showdown, the “Horrible Bosses” actress is expected to go under the surgeon’s knife, sources say. “Jen wants to look younger than Angelina – and hotter than ever,” an insider told The National EN QUIRER .

While a rep for Jen vehemently denied she is having a facelift, the insider added: “It’s going to be crazy for her to have to see Brad again and she wants to have a ‘look at me now’ moment. “So I think she’s planning to have a mini facelift freshen-up in August.”

As The ENQUIRER has reported, Angelina has slammed Clooney’s fiancée, 36-year-old international lawyer Amal Alamuddin. Mother of six Angie, who’s a United Nations envoy for refugees, considers the British beauty a rival because of her own attention-grabbing work for human rights causes.

But sources say Angelina has agreed to put her differences aside and attend the wedding – paving the way for a possible showdown with Brad’s ex!

“Jen will find it terrifying to cross paths with both Brad and Angelina, which is why she wants to look her very best,” said the source. “I think her plan is to make nice with both of them and be not only the bigger person, but also the hottest!”