While her twin sister is busy partying it up overseas at the Atlantis hotel in Dubai, Ashley Olsen was spotted hitting up the New York City party circuit on Thursday night (November 20).

Wearing a black robe-like ensemble, the twin mogul helped MANGO celebrate the relaunch of their Soho flagship store alongside company President Isak Andic, as well as Penelope Cruz’s MANGO designer sister Monica Cruz.

She’s been all over the world over the past month, and now that she’s back in the Big Apple, Ashley Olsen is keeping herself busy with promotion for her new book.

The “Full House” hottie was spotted on her way to the Ed Sullivan Theatre this afternoon (October 30) to tape a segment for “The Late Show with David Letterman” and talk about Influence, her new release with twin sister Mary-Kate.

They’re no strangers to traveling the world together, and earlier today Lindsay Lohan and Samantha Ronson were spotted checking out the Charlotte Ronson Autumn 2008 Fashion Show in Tokyo, Japan.

The “Mean Girls” starlet and her deejay lover were the guests of honor at Ronson’s twin sister’s runway shindig, with LiLo even sporting a flowered dress designed by Charlotte.

Out supporting her twin sister, Samantha Ronson was up bright and early with Lindsay Lohan as the two headed to the Charlotte Ronson show as part of New York City Fashion Week on Saturday (September 6).

Sam’s sister’s show got underway at around 11 AM ET in the Promenade, with much excitement over her return to the big Bryant Park show following 5 seasons of hosting displays offsite.