Avril Lavigne celebrates her 33rd birthday in racy, lacy number

The "S8kr" girl is no more!

Avril Lavigne opted for a racy, lacy all-black ensemble to ring in her 33rd birthday at TAO Los Angeles on Wednesday.

The "Complicated" singer's lingerie-inspired, cleavage-baring mini slipdress left little to the imagination, though she did top it off with a duster jacket and accessorize with chunky silver jewelry, a studded quilt Valentino clutch and thigh-high heeled leather boots.

Avril Lavigne - 33rd birthday
Photo: Backgrid

MORE: Avril Lavigne and Chad Kroeger Open Up About Their Relationship Post-Split

Lavigne seemed to have a great time celebrating her big day, sharing a fun pic from inside the Hollywood hot spot that she captioned, "Birthday dinner with all my besties." 

Birthday dinner with all my besties. Thank you @taola @shaesavin #friends #birthdayparty

A post shared by Avril Lavigne (@avrillavigne) on

Not only did her crew dine on filet mignon, miso roasted black cod, chicken satay and crispy rice tuna, but after dinner, Lavigne's pals sang her "Happy Birthday" as she was presented with a cake with sparklers.

One of those BFFs was Ryan Cabrera, whom she sat next to at dinner. Earlier in the day, he also sent her birthday wishes via Instagram.

42 PHOTOS
Avril Lavigne through the years
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Avril Lavigne through the years
Avril Lavigne at 'The Tonight Show with Jay Leno' at the NBC Studios in Burbank, Ca. Thursday, June 6, 2002. Photo by Kevin Winter/ImageDirect.
Avril Lavigne performs at Irving Plaza in New York City. 7/31/02 Photo by Scott Gries/ImageDirect
Avril Lavigne at 'The Tonight Show with Jay Leno' at the NBC Studios in Burbank, Ca. Wednesday, Oct. 9, 2002. Photo by Kevin Winter/Getty Images.
LONDON - APRIL 27: Singer Avril Lavigne performs on stage during her secret fan club gig at the Camden Monarch on April 27, 2004 in London. The 19-year-old Canadian star, who has sold 14 million albums, releases her new single 'Don't Tell Me' on May 10 and her second album 'Under My Skin' on May 24. (Photo by Jo Hale/Getty Images)
NEW YORK - MAY 25: (U.S. TABS OUT) Avril Lavigne appears on stage during MTV's Total Request Live at the MTV Times Square Studios May 25, 2004 in New York City. (Photo by Scott Gries/Getty Images)
LAS VEGAS, NV - SEPTEMBER 15: Avril Lavigne is seen on stage during rehearsal for the 2004 World Music Awards at the Thomas and Mack Center on September 15, 2004 in Las Vegas, Nevada. (Photo by Pascal Le Segretain/Getty Images)
LAS VEGAS, NEVADA : SEPTEMBER 15: Singer Avril Lavigne arrives at the 2004 World Music Awards at the Thomas & Mack Centre on September 15, 2004 in Las Vegas. (Photo by Jo Hale/Getty Images)
NEW YORK - DECEMBER 16: Musician Avril Lavigne performs onstage during Fuse TV's Daily Download at the Fuse Studios on December 16, 2004 in New York City. (Photo by Scott Gries/Getty Images)
MELBOURNE, AUSTRALIA - APRIL 09: Singer Avril Lavigne performs live in concert at the Rod Laver Arena April 09, 2005 in Melbourne, Australia. (Photo by Kristian Dowling/Getty Images)
BEVERLY HILLS, CA - OCTOBER 18: Singer Avril Lavigne arrives at The Lili Claire Foundation's 6th Annual Benefit at the Beverly Hilton Hotel on October 18, 2003 in Beverly Hills, California. (Photo by Kevin Winter/Getty Images)
WESTWOOD, CA - APRIL 3: Musician Avril Lavigne performs on stage during Nickelodeon's 17th Annual Kids' Choice Awards at Pauley Pavilion on the campus of UCLA, April 3, 2004 in Westwood, California. (Photo by Kevin Winter/Getty Images)
LONDON - APRIL 27: Singer Avril Lavigne performs on stage during her secret fan club gig at the Camden Monarch on April 27, 2004 in London. The 19-year-old Canadian star, who has sold 14 million albums, releases her new single 'Don't Tell Me' on May 10 and her second album 'Under My Skin' on May 24. (Photo by Jo Hale/Getty Images)
NEW YORK - MAY 21: Singer Avril Lavigne performs on the 'Today' show, May 21, 2004 in New York City. Lavigne has just released a new cd. (Photo by Scott Eells/Getty Images)
NEW YORK - MAY 25: (U.S. TABS OUT) Avril Lavigne appears on stage during MTV's Total Request Live at the MTV Times Square Studios May 25, 2004 in New York City. (Photo by Scott Gries/Getty Images)
BURBANK, CA - JUNE 21: Singer Avril Lavigne appears on 'The Tonight Show with Jay Leno' at the NBC Studios on June 21, 2004 in Burbank, California. (Photo by Kevin Winter/Getty Images)
NEW YORK - SEPTEMBER 7: Musician Avril Lavigne rehearses for 'Fashion Rocks' September 7, 2004 at Radio City Music Hall in New York City. The show will air on Fox on September 26. (Photo by Frank Micelotta/Getty Images)
LAS VEGAS, NV ? SEPTEMBER 15: Avril Lavigne accepts the award on stage during the 2004 World Music Awards at the Thomas and Mack Center on September 15, 2004 in Las Vegas, Nevada. (Photo by Pascal Le Segretain/Getty Images)
WESTWOOD, CA - APRIL 01: Actor Bruce Willis (L) and singer Avril Lavigne arrive at the 19th Annual Kid's Choice Awards held at UCLA's Pauley Pavilion on April 1, 2006 in Westwood, California. (Photo by Frazer Harrison/Getty Images)
WEST HOLLYWOOD, CA - APRIL 26: Singer Avril Lavigne attends the US Weekly Hot Hollywood Awards party held at the Republic restaurant and lounge on April 26, 2006 in West Hollywood, California. (Photo by Frazer Harrison/Getty Images)
Cannes, FRANCE: Canadian singer/actress Avril Lavigne poses during a photocall for US directors Tim Johnson and Karey Kirkpatrick's animation film 'Over the Hedge' at the 59th edition of the Cannes Film Festival in Cannes, southern France, 21 May 2006. The film is presented out-of-competition. AFP PHOTO / PASCAL GUYOT (Photo credit should read PASCAL GUYOT/AFP/Getty Images)
Cannes, FRANCE: Canadian singer/actress Avril Lavigne waves at spectators next to US actor Bruce Willis upon arriving at the Festival Palace for the premiere of US directors Tim Johnson and Karey Kirkpatrick's animated film 'Over the Hedge' at the 59th edition of the Cannes Film Festival in Cannes, southern France, 21 May 2006. The film is presented out-of-competition. AFP PHOTO / FRANCOIS GUILLOT (Photo credit should read FRANCOIS GUILLOT/AFP/Getty Images)
PARIS - MARCH 25: Singer Avril Lavigne performs on stage during the MTV live Show at the Elysee Montmartre on March 25, 2007 in Paris, France. (Photo by Pascal Le Segretain/Getty Images)
NEW YORK - APRIL 16: (U.S. TABS OUT) Musician Avril Lavigne appears onstage during MTV's Total Request Live at the MTV Times Square Studios on April 16, 2007 in New York City. (Photo by Bryan Bedder/Getty Images)
PERTH, UNITED KINGDOM - JULY 08: Avril Lavigne performs at the T in the Park music festival at Balado, Kinross-shire July 8, 2007 in Perth, Scotland. With 80,000 fans expected to attend to see acts such as The Fratellis, Scissor Sisters and Snow Patrol. (Photo by Jeff J Mitchell/Getty Images)
UNIVERSAL CITY, CA - AUGUST 26: Singer Avril Lavigne accepts the 'Choice Music Single' for 'Girlfriend' onstage during the 2007 Teen Choice Awards held at The Gibson Amphitheatre on August 26, 2007 in Universal City, California. (Photo by Kevin Winter/Getty Images)
NEW YORK - SEPTEMBER 05: (U.S. TABS OUT) Singer Avril Lavigne performs onstage during MTV's Total Request Live at the MTV Times Square Studios on September 5, 2007 in New York City. (Photo by Bryan Bedder/Getty Images)
MEXICO CITY - OCTOBER 18: Singer Avril Lavigne performs onstage during the Los Premios MTV Latin America 2007 at the Palacio De Los Deportes October 18, 2007 in Mexico City, Mexico. (Photo by Kevin Winter/Getty Images)
MUNICH, GERMANY - NOVEMBER 01: Avril Lavigne performs during the show at the MTV Europe Music Awards 2007 at the Olympiahalle on November 1, 2007 in Munich, Germany. (Photo by Sean Gallup/Getty Images for MTV)
Canadian Avril Lavigne performs during the World Music Awards, in Monaco, 04 November 2007. The World Music Awards Award is an international awards show with winners being named based on worldwide album sales. AFP PHOTO / STEPHANE DANNA (Photo credit should read STEPHANE DANNA/AFP/Getty Images)
LOS ANGELES, CA - OCTOBER 14: Recording artist Avril Lavigne performs at the premeire of Nokia Productions' Spike Lee Collaboration film held at the Nokia Theater L.A. Live on October 14, 2008 in Los Angeles, California. (Photo by Alberto E. Rodriguez/Getty Images)
NEW YORK - SEPTEMBER 14: Designer Avril Lavigne on the runway at Abbey Dawn by Avril Lavigne showcasing its fall/holiday 2009 collection, available exclusively at Kohl's, at 'STYLE360 at Metropolitan Pavilion North' on September 14, 2009 in New York City. (Photo by Jeff Gentner/Getty Images)
LOS ANGELES, CA - NOVEMBER 21: Singer Avril Lavigne (R) arrives at the 2010 American Music Awards held at Nokia Theatre L.A. Live on November 21, 2010 in Los Angeles, California. (Photo by Jason Merritt/Getty Images)
Canadian pop star Avril Lavigne performs onstage at the Ariston Theatre in San Remo, Italy during the 61st San Remo Music Festival on February 19, 2011. AFP PHOTO/ TIZIANA FABI (Photo credit should read TIZIANA FABI/AFP/Getty Images)
NEW YORK, NY - MARCH 08: Avril Lavigne attends the release party for Avril Lavigne's new album 'Goodbye Lullaby' at SL Lounge on March 8, 2011 in New York City. (Photo by D Dipasupil/Getty Images)
TORONTO, ON - JUNE 19: Avril Lavigne performs on stage at the 2011 MuchMusic Video Awards on June 19, 2011 in Toronto, Canada. (Photo by Jag Gundu/Getty Images)
UNIVERSAL CITY, CA - AUGUST 07: Singer Avril Lavigne arrives at the 2011 Teen Choice Awards held at the Gibson Amphitheatre on August 7, 2011 in Universal City, California. (Photo by Jason Merritt/Getty Images)
NEW YORK, NY - SEPTEMBER 12: Musician/designer Avril Lavigne walks the runway at the Abbey Dawn by Avril Lavigne Spring 2012 fashion show during Style360 on September 12, 2011 in New York City. (Photo by Slaven Vlasic/Getty Images)
NEW YORK, NY - SEPTEMBER 10: Designer Avril Lavigne attends Abbey Dawn By Avril Lavigne Spring 2013 at the Metropolitan Pavilion on September 10, 2012 in New York City. (Photo by Chelsea Lauren/Getty Images)
LAS VEGAS, NV - MAY 19: Chad Kroeger of Nickleback and Avril Lavigne arrive at the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Jason Merritt/Getty Images)
LAS VEGAS, NV - SEPTEMBER 21: Singer Avril Lavigne performs onstage during the iHeartRadio Music Festival Village on September 21, 2013 in Las Vegas, Nevada. (Photo by Christopher Polk/Getty Images for Clear Channel)
PHILADELPHIA, PA - DECEMBER 04: Singer Avril Lavigne performs onstage during Q102Âs Jingle Ball 2013 presented by Bernie Robbins Jewelers, at Wells Fargo Center on December 4, 2013 in Philadelphia, PA. (Photo by Theo Wargo/Getty Images for Clear Channel)
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"Haaaappy birfday week to this badass batch @avrillavigne," the "On the Way Down" singer wrote. "You r truly one of a kind & as beautiful inside as you are out!! Can't wait for u to shock the world with yur new music!!"

RELATED: Avril Lavigne Shares Thank You to Fans & Update on New Album: 'It's Been a Long Recovery'

After a two-hour dinner, the group headed to Warwick LA, where they sat at a reserved table in the front until about 1 a.m. "Everyone enjoyed a couple of cocktails," an eyewitness told ET. "It was super low-key."

Lavigne has slowly been returning to the spotlight. The Abbey Dawn designer was diagnosed with Lyme disease in 2014 and spent five months bedridden during her recovery. In fact, her birthday request was for fans to help her celebrate by supporting her non-profit, the Avril Lavigne Foundation, which has recently partnered with the LymeLight Foundation.

She has frequently given updates on her progress, though, including a big one in November 2015, where she revealed that she was "coming out on the other side." Just last month, she thanked fans on social media "for their patience as I work on putting together this new album."

"It's been a long recovery and I want to make sure that this is perfect for you guys!" she wrote.

The pop-punk princess first announced that she was working on a new album on Christmas last year. This will be her first album since her self-titled LP in 2013, though she did release a duet with Nick Carter titled "Get Over Me" in January 2016.

More celebrity sightings from this week:

30 PHOTOS
Celeb Spotter 035: Gigi and Bella Hadid in Paris, J.Rod with their kids
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Celeb Spotter 035: Gigi and Bella Hadid in Paris, J.Rod with their kids

Bella Hadid narrowly avoided a wardrobe malfunction while out and about during Paris Fashion Week.

(Photo by Mehdi Taamallah/NurPhoto via Getty Images)

J.Lo and Alex Rodriguez were spotted leaving ABC Kitchen in NYC with J.Lo's twins, Emme and Max. (Photo by Raymond Hall/GC Images)

Catherine Zeta-Jones looked absolutely gorgeous in a figure-hugging pink dress in NYC.

(Photo by James Devaney/GC Images)

Model Karlie Kloss flashed her undergarments in a sheer skirt while out in Paris.

(Photo by Marc Piasecki/GC Images)

Nicole Richie looked like a total star while making the promo rounds in New York City.

(Photo by Raymond Hall/GC Images)

Harrison Ford kept it cool during an appearance at AOL Build this week.

(Photo by VMAL/Star Max/GC Images)

Whatcha lookin' at?! Kourtney Kardashian and Younes Bendjima were spotted leaving their hotel together in Paris. (Photo by Pierre Suu/GC Images)

Emily Ratajkowski toasted InStyle Editor in Chief Laura Brown and designer Justin O'Shea's with Grey Goose at the Chez Away dinner during Paris Fashion Week.

(Credit: Kelly Taub/BFA.com)

Selena Gomez went braless in a mustard-yellow top in NYC.

(Photo by Josiah Kamau/BuzzFoto via Getty Images)

Gigi Hadid was a total vision in a plunging white ensemble with a major slit up the middle, which she wore to a launch party during Paris Fashion Week.

(Photo by Pierre Suu/Getty Images)

Kourtney Kardashian rolled her eyes while making her way through the crowd in Paris.

(Photo by Marc Piasecki/GC Images)

Karlie Kloss took a break from Paris Fashion Week to get a quick jog in.

(Photo by Jacopo Raule/GC Images )

Lorde snapped a selfie with a fan in London.

(Photo by Neil Mockford/GC Images)

Karlie Kloss was stunning in a black ensemble for an event during Paris Fashion Week.

(Photo by Pierre Suu/Getty Images)

Sofia Vergara looked stunning in an off-the-shoulder dress while making the rounds during a promo tour in NYC.

(Photo by Josiah Kamau/BuzzFoto via Getty Images)

Ashley Graham was spotted out and about in NYC.

(Photo by Josiah Kamau/BuzzFoto via Getty Images)

Nicole Richie looked like a total goddess out promoting her NBC sitcom "Great News."

(Photo by Josiah Kamau/BuzzFoto via Getty Images)

Viola Davis flashed her incredible smile as she walked into "GMA" wearing some incredible, gold platform shoes.

(Photo by Ray Tamarra/GC Images)

Elle Fanning braved the rain while filming her upcoming Woody Allen movie.

(Photo by Alessio Botticelli/GC Images)

Kyra Sedgwick stopped by AOL Build this week in a pretty, pink tea-length dress.

(Photo by VMAL/Star Max/GC Images)

Hailey Baldwin turned heads while out and about during Paris Fashion Week this week.

(Photo by Timur Emek/Getty Images)

Emily Ratajkowski looked beautiful in a unique white top, jeans and knee-high red boots.

(Photo by Timur Emek/Getty Images)

Hailey Baldwin rocked green pants with strategically-placed slits while out and about for Paris Fashion Week.

(Photo by Timur Emek/Getty Images)

Sarah Jessica Parker was all smiles out and about in New York City. (Photo by UMV/Star Max/GC Images)
Liv Tyler and David Gardner was spotted leaving an event together in London. (Photo by Mark R. Milan/GC Images)

Sofia Vergara was a bombshell in a LBD at "The Late Show."

(Photo by Raymond Hall/GC Images)

Goldie Hawn kept it casual in an all-black workout ensemble at LAX.

(Photo by BG022/Bauer-Griffin/GC Images)

Model Kaia Gerber was totally chic in a black-and-red getup during Paris Fashion Week.

(Photo by Mehdi Taamallah/NurPhoto via Getty Images)

Demi Lovato was stunning in a LBD at a party in London.

(Photo by Neil Mockford/GC Images)

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