Her superstar sibling was at hand to help and appeared to be comforting her, covering her up in the back of the vehicle.
A source told TMZ: "Solange suffered some kind of food allergy, though she isn't sure what it was from....the hives were gone in a matter of minutes."
MailOnline has contacted the star's representative for comment.
Luckily for Solange, it seems her angry allergic breakout only occurred at the end of the ceremony and didn't ruin the whole day.
She was the epitome of elegance as she walked down the aisle with her long-term love Alan, clad in a conservative yet chic cape dress.
After the wedding bells rang, Solange opted to let loose, slipping out of her floor-length gown and into a plunging jumpsuit - her second of the day - to commemorate her nuptials.
Solange Knowles and her new husband, music video director Alan Ferguson. Photo / Getty Images
But the 28-year-old singer seemed to be so high on love she didn't realize she suffered from a minor wardrobe malfunction while dancing the night away at a Mardi Gras style parade in New Orleans' French Quarter.
Unfortunately, Solange had a slight nip slip, revealing a bit too much through the large cut-out in the front of her bright white caped onesie.
After recognising the dilemma, she was seen holding a hand over her chest.
Yet, nothing could keep the blushing bride from enjoying her big day, unable to stop smiling amid of any dramas.
Solange and her wedding guests. Photo / Getty Images
Prior to her party, Solange was spotted in a Humberto Leon for Kenzo floor-length gown with an attached cape, which is what she wore to say 'I do' to her longtime love, reports Us Weekly.
And the star wore yet another wedding ensemble, a plunging cream jumpsuit, as she and her love arrived at the venue together, riding bicycles.
Her hair was styled in its signature Afro and she added a pop of collar to her cream ensemble with crimson lips which remained throughout the day.
Solange's older sister Beyonce was also a glamorous sight at the nuptials on Sunday afternoon wearing the Maggie dress from collection Torn by Ronny Kobo.
Beyonce also posted some snaps from Solange's big day:
Did she break free from Art In The Dark?
You're looking at the new face of Estee Lauder!
The purrrfect cat bed.
Attractive band + Good Music = Girls Screaming.
- Daily Mail