News that the California native was stateside broke on Monday.
Abigail Spencer, who costarred with Meghan on Suits, arrived at the hotel holding a gift bag decorated with green and blue flowers.
The actress shared a photo of herself on Instagram making her way through an airport on Monday, sparking talk that she may be joining her pal for the celebrations.
Toronto-based stylist Jessica Mulroney, whose three children served important roles in Meghan’s bridal party at her royal wedding, is among those expected to host Meghan’s baby shower.
Friends reported to also be in attendance include Serena Williams, Priyanka Chopra and Misha Nonoo.
Meghan’s mother, Doria Ragland, could also fly in from Los Angeles for the celebration.
Decorations believed to be for the bash, including dozens of floral arrangements, were delivered outside the The Mark on Tuesday.