The 36-year-old "Bride Wars" star shared a picture with the former "Friends" actress with the hash tag, "Lets Convince Jen To Get On Instagram", reported Female First.
"Day 1: Who's that gorgeous lady peekin over my shoulder #SuchFun #GirlsAtWork #MothersDayMovie
#LetsConvinceJenToGetOnInstagram (sic)," she captioned the photo in which Aniston is seen hiding half of her face behind Hudson's right shoulder.
Earlier, Aniston, 46, who took over Living Proof's Instagram account for a day, said "it was too much pressure."