Nothing tells the world you're in love quite like a PDA-packed social snap. For celebrities, it's the ultimate way of giving their fans an inside view of their relationships and home lives. Everyone from Gisele Bündchen to First Lady Michelle Obama is getting in on the trend, sharing archived wedding  photos, formative moments from the early days of lasting commitments, and more. A notable newcomer to Instagram , Jessica Simpson  recently shared an intimate kiss with her future husband, Eric Johnson; and Channing Tatum  took his followers into a fun photo booth session with his wife, Jenna Dewan. Keep reading to see the best PDA we've seen so far, and if you're in the mood to turn the heat up a notch, check out celebrities getting sexy on Instagram !
Tom Brady and Gisele Bündchen
In a throwback photo, Gisele showed the sweet kiss Tom gave her at their wedding  in 2009.
Source: Instagram user giseleofficial 
Jessica Simpson and Eric Johnson
The fiancés locked lips to celebrate St. Patrick's Day 2014. "My Irishman has worn this shirt every year thanks to his Dad wearing it years before...of course I will kiss you!" Jessica wrote in the caption.
Source: Instagram user jessicasimpson 
Kim Kardashian and Kanye West
In 2012, long before North West came into the world, Kim took to Instagram to share the way she smiles at Kanye.
Source: Instagram user kimkardashian 
Chrissy Teigen and John Legend
In a latergram from a trip to Miami, Chrissy showed how her crooner husband puts the moves on her.
Source: Instagram user chrissyteigen 
Justin Bieber and Selena Gomez
Justin captured one of his reunions with Selena in 2014, writing, "Love the way you look at me."
Source: Instagram user justinbieber 
Beyoncé and Jay Z
The singer posted a candid snap of a kiss Jay Z gave her.
Source: Instagram user beyonce 
David and Victoria Beckham
Victoria's closed-mouth smile was on display when she wrapped her arms around her shirtless  husband.
Source: Instagram user victoriabeckham 
Britney Spears and Jason Trawick
Months before the couple split, Britney snuggled up to Jason Trawick backstage at a Whitney Houston tribute. "Such a solemn occasion. Jason's doing his best to put a smile on my face," Britney captioned the snap.
Source: Instagram user britneyspears 
First Lady Michelle and President Barack Obama
The first lady is a fan of #ThrowbackThursday posts. In this snap, Michelle wrapped her arm around America's future president.
Source: Instagram user michelleobama 
Jessica Alba and Cash Warren
Before the couple dug into a serious bowl of shaved ice, Jessica pressed her lips on Cash's cheek.
Source: Instagram user jessicaalba 
Rachel Zoe and Rodger Berman
Rachel wished her husband a happy anniversary in this heartwarming image, writing, "Proposing all over again 16 years later!" Just look at how cute their son Skyler is in the background.
Source: Instagram user rachelzoe 
Lena Dunham and Jack Antonoff
Lena rested in Jack's lap in the couple's selfie.
Source: Instagram user lenadunham 
Channing Tatum and Jenna Dewan
The husband and wife got romantic and silly at Vanity Fair's Oscars party in 2013, packing in kisses in the photo booth.
Source: Instagram user channingtatum 
Sarah Hyland and Matt Prokop
Sarah Hyland gave her boyfriend, Matt Prokop, a closed-eyed smooch.
Lauren Conrad and William Tell
"Happy Anniversary to my favorite Valentine . . . I love you dearly xo," the former Hills star wrote to her fiancé and followers.
Source: Instagram user laurenconrad 
Neil Patrick Harris and David Burtka
Neil pulled his partner in to capture their boyish grins.
Source: Instagram user instagranph