Celeb Spotter 077: Chrissy Teigen and Reese Witherspoon start book tours, models hit Milan Fashion Week

Fashion month continues!

Gigi and Bella Hadid, Kendall Jenner, Kaia Gerber and more of the world's top models jetted off to Italy this week for Milan Fashion Week, during which they were all photographed stepping out together on various occasions.

Back in the Big Apple, Chrissy Teigen celebrated the release of her second cookbook, "Cravings: Hungry For More," with a slew of appearances, while Reese Witherspoon also kicked off her "Whiskey in a Teacup" book tour.

Ariana Grande made her first public outing since ex Mac Miller's shocking overdose, Carrie Underwood debuted her baby bump and Hailey Baldwin watched along as fiancé Justin Bieber delivered an impromptu performance outside of Buckingham Palace.

See the best celebrity sightings of the week below:

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Celeb Spotter 077: Chrissy Teigen and Reese Witherspoon start book tours, models hit Milan Fashion Week
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Celeb Spotter 077: Chrissy Teigen and Reese Witherspoon start book tours, models hit Milan Fashion Week

Toni Braxton left little to the imagination in a sheer black shirt for dinner at West Hollywood hot-spot Craig's on Tuesday night.

(Photo by Hollywood To You/Star Max/GC Images)

Jessica Simpson showed off her growing baby bump while out and about in New York City on Thursday.

(Photo by Raymond Hall/GC Images)

Carrie Underwood showed off her burgeoning baby bump while walking around on the "Jimmy Kimmel Live!" set.

(Photo by BG017/Bauer-Griffin/GC Images)

Chrissy Teigen was spotted out and about on Wednesday in New York City while doing promo for her new cookbook.

(Photo by James Devaney/GC Images)

Bella Hadid narrowly avoided a wardrobe malfunction while out and about during Milan Fashion Week on Friday.

(Photo by Arnold Jerocki/Getty Images)

Bella Hadid narrowly avoided a wardrobe malfunction while out and about during Milan Fashion Week on Friday.

(Photo by Arnold Jerocki/Getty Images)

Power duo! Victoria Beckham and Anna Wintour were photographed walking into Beckham's Dover Street store in London on Tuesday.

(Photo by Neil Mockford/GC Images)

Katie Holmes was glamorous in red as she arrived at the Rainbow Room on Thursday night in New York City.

(Photo by James Devaney/GC Images)

Ariana Grande danced around in the rain in New York City on Tuesday with friends.

(Photo by Robert Kamau/GC Images)

Justin Bieber gave an impromptu performance outside of Buckingham Palace as fiancée Hailey Baldwin looked on in London on Tuesday.

(Photo by Ricky Vigil/GC Images)

Hailey Baldwin filmed fiancé Justin Bieber as he gave an impromptu performance outside of Buckingham Palace in London on Tuesday.

(Photo by Ricky Vigil/GC Images)

Nicki Minaj rocked head-to-toe Fendi during an appearance at Milan Fashion Week on Thursday.

(Photo by Arnold Jerocki/Getty Images)

Sophie Turner and Joe Jonas were spotted leaving sweetgreen in New York City on Thursday.

(Photo by Tal Rubin/GC Images)

Kaia Gerber braved the crowds at Milan Fashion Week on Wednesday.

(Photo by Arnold Jerocki/Getty Images

Gigi Hadid and Kendall Jenner rocked matching shades while heading into an appointment during Milan Fashion Week on Wednedsay.

(Photo by Arnold Jerocki/Getty Images

Chrissy Teigen rocked an orange dress for her appearance on "Good Morning America" on Wednesday morning.

(Photo by James Devaney/GC Images)

Jesse Tyler Ferguson (right) and Justin Mikita (left) joined chef Roy Choi at The Flamin Hot Spot, Cheetos' new limited-time restaurant at Madera Kitchen on Thursday night in Hollywood.

PS -- love Justin's red frames? We found similar ones from Zenni for just $30.

(Photo by Rachel Murray/Getty Images for Frito-Lay North America)

Andy Cohen rocked a suit as he had some fun with photographers while out in New York City on Wednesday.

(Photo by Gotham/GC Images)

Jane Fonda looked stunning in a sheer leopard-print top while out and about in New York City on Wednesday night.

(Photo by MediaPunch/Bauer-Griffin/GC Images)

Dave Chappelle hosted "Dave Chappelle's Private After Party" at The h.wood Group's special preview oof Harriet's Rooftop Lounge at the upcoming 1 Hotel West Hollywood on Tuesday night.

(Photo by Vivien Killilea/WireImage)

Emma Stone was all smiles leaving "The Late Show" on Wednesday night in NYC.

(Photo by James Devaney/GC Images)

Tori Spelling was spotted walking into No. 10 Restaurant for a pal's birthday dinner in Los Angeles this week.

(Credit: Hellmuth Dominguez)

Bradley Cooper and Irina Shayk stepped out for a family stroll over the weekend looking effortlessly chic wearing the Gold Leaf Choker by London-based jewelry brand, MISSOMA.

(Photo Credit: Courtesy of Missoma)

Reese Witherspoon was feeling the blues as she stepped out in New York City on Monday.

(Photo by Robert Kamau/GC Images)

"Modern Family" star Sarah Hyland was spotted out and about on Wednesday following a workout in Los Angeles.

(Photo by BG005/Bauer-Griffin/GC Images)

Adam Brody made a rare public outing at the "Let Science Speak" screening at Spring Studios for the Tribeca TV Festival on Thursday in New York City. 

(Photo by Noam Galai/Getty Images)

Bella Hadid risked a wardrobe malfunction in a barely-buttoned cardigan while leaving her hotel in Paris on Tuesday.

(Photo by Marc Piasecki/GC Images)

Singer Charli XCX attended the "Assassination Nation" after party, where the star-studded crowd sipped on SVEDKA Vodka cocktails.

(Photo by Michael Kovac/Getty Images for NEON)

Kaia Gerber looked just like her mother, Cindy Crawford, while out and about during Milan Fashion Week on Thursday.

(Photo by Arnold Jerocki/Getty Images)

Singer Elle King performed with The Roots at Six Degrees to Tennessee Roots Jam at the New Daisy Theater on Sunday in Memphis, Tennessee.

(Photo by Greg Campbell/Getty Images for Tennessee Tourism)

Bella Hadid showed off her toned abs in a white crop top and SENSO kitten heels while out and about during Milan Fashion Week on Wednesday.

(Photo by Arnold Jerocki/Getty Images

Rosie Huntington-Whiteley and Jason Statham were photographed leaving Gymkhana and heading to Isabel Mayfair for drinks on Wednesday night in London.

(Photo by Ricky Vigil/GC Images)

Rapper Busta Rhymes was on-hand to crown the winner of the Doritos Blaze The Beat contest at the Life Is Beautiful pre-party in Las Vegas.

(Photo by David Becker/Getty Images for Doritos)

Chrissy Teigen rocked a flowing red dress and thigh-high boots while out and about promoting her new cookbook in New York City on Thursday.

(Photo by Raymond Hall/GC Images)

Former "Girls" actress Jemima Kirke spoke at the Saks Fearless Women Speaker Series on Thursday in NYC.

(Photo by Astrid Stawiarz/Getty Images for Saks Fifth Avenue)

Chrissy Teigen was all smiles heading into Build Series on Wednesday in New York City.

(Photo by UMV/Star Max/GC Images)

Jessica Simpson was spotted out and about in SoHo on Wednesday in a leopard print dress and velvet coat.

(Photo by Raymond Hall/GC Images)

St. Lucia performed at The Rooftop at Pier 17, a stunning new 1.5 acre outdoor space at The Seaport District, in New York City on Friday night.

(Credit: Mark Davis on behalf of The Howard Hughes Corporation)

Model Emily Ratajkowski stepped out in a two-piece white look during Milan Fashion Week on Friday.

(Photo by Robino Salvatore/GC Images)

Gigi Hadid was spotted out and about in Milan during Milan Fashion Week on Thursday.

(Photo by Arnold Jerocki/Getty Images)

These boots were made for walkin'! Kendall Jenner stepped out during Milan Fashion Week with pal Bella Hadid on Thursday.

(Photo by Arnold Jerocki/Getty Images)

Reese Witherspoon rocked all black for an outing in NYC on Tuesday, where she embarked on her "Whiskey in a Teacup" book tour.

(Photo by Gotham/GC Images)

Leandra Medine Cohen stepped out in NYC to host the opening of Ba&sh Nolita, the brand’s 1st experiential store.

(Photo Credit: BFA Courtesy of Ba&sh)

Chrissy Teigen made another appearance in New York on Friday, this time in a chic all-black ensemble.

(Photo by Gotham/GC Images)

Rita Ora stepped out in a sexy LBD during Milan Fashion Week on Friday.

(Photo by Robino Salvatore/GC Images)

Anwar Hadid showed off a hickey as he stepped out during Milan Fashion Week on Thursday.

(Photo by Arnold Jerocki/Getty Images)

Cate Blanchett was photographed walking into the Rainbow Room on Thursday evening in New York City.

(Photo by James Devaney/GC Images)

Pete Davidson was photographed on the streets of NYC on Thursday night.

(Photo by James Devaney/GC Images)

Justin Theroux rocked a black velvet suit jacket while out and about on Thursday night in NYC.

(Photo by JNI/Star Max/GC Images)

Pete Davidson rocked a Snoopy t-shirt and camo pants as he gave the paparazzi a taste of their own medicine on Thursday in New York City.

(Photo by Gotham/GC Images)

DJ and producer Marshmello teamed up with Victoria's Secret for the PINK Loves Chicago event on Saturday in Chicago.

(Photo by Robin Marchant/Getty Images for Victoria's Secret PINK)

Bella Hadid and a handler were spotted out and about in Milan during fashion week on Thursday. 

(Photo by Arnold Jerocki/Getty Images)

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