Elizabeth got engaged to actor Boyd Holbrook in March of this year after dating for nearly two years.
Reports recently surfaced that the 25-year-old actress was planning a double wedding with her 27-year-old sister.
But at the Godzilla junket, Elizabeth set the record straight to E!'s Alicia Quarles.
"Someone asked me...if my sister and I are having a double wedding and I said, ‘No.' And they're like, ‘Planning! Wedding plans!'And I'm like, ‘I just said 'no' to a question.' But I guess that means a lot more is happening."
Olsen says the experience taught her to tread more carefully during interviews.
"It's weird. These are the times when I'm like, ‘I should watch what I say.'"
As for the actress' older sister, she is set to wed Olivier Sarkozy.
The 44-year-old French banker is the half-brother of Nicolas Sarkozy, former President of France.
Olsen has been seen repeatedly sporting the same exact ring on that finger, although the couple has yet to confirm they are planning to tie the knot.