The "30 Rock" star had proposed to Thomas earlier this year and subsequently hinted that they were planning to get married in September. Baldwin is likely to exchange vows with Thomas at a secret location in Europe.
"They've been telling people they'll be spending time in Europe, and there's speculation they're going to get married," nypost.com quoted an insider as saying.
Mumbai Roundup: 9 incidents that took place this week
Photos: Ajay Devgn, Parineeti, Tabu at 'Golmaal Again' trailer launch
Photos: Dipika Pallikal Karthik oozes oomph in bikinis and sarees
Photos: Kareena Kapoor Khan's grand birthday bash
Photos: 'Dangal' girls Sanya Malhotra, Fatima Sana Shaikh's dinner outing